MURNAGHAN, Circuit Judge:
In 1971 Charles H. Moore, appellant, sought black lung benefits under the Black Lung Benefits Title of the Federal Coal Mine Health and Safety Act of 19691 (“Black Lung Benefits Act”2). The claim was denied by the Secretary of Health, Education and Welfare, now the Secretary of Health and Human Services (“the Secretary”), whose action was sustained by the district court as supported by substantial evidence.
The problem which confronts us is whether nearly a decade of activity as a miner while Moore was self-employed in a family mine or employed by a close corporation of which he was a principal shareholder3 should be considered for purposes of certain favorable presumptions established by statute to determine eligibility. We hold that it should be so considered and reverse. Considering those years of self-employment gives Moore over fifteen years of coal mine employment, as against the less than ten years allowed by the Secretary for periods when Moore’s mining activities took place while he was the employee of mine operators other than himself and his close corporation.
I
The Statute.
The case is governed by the provisions of the act as they existed prior to amendment in 1978.4 Under those provisions, benefits [910]*910shall be paid with respect to the disability of a person if four requirements are satisfied:5
1. The person must be a miner, which the statute defines as “any individual who is or was employed in a coal mine.”6
2. The person must be totally disabled as determined by regulations prescribed by the Secretary.7
3. The total disability must be due to pneumoconiosis, “a chronic dust disease of the lung.”8
4. It must be shown that the disease is one “arising out of employment in a coal mine.”9
To facilitate the administration of the act and to ease the inherent difficulties of proving the existence and the causation of the disease, the statute makes available several presumptions to help establish requirements 2, 3, and 4 above. Thus, “if a miner is suffering . . from a chronic dust disease of the lung which [yields specified medical symptoms when diagnosed by X-ray, biopsy, or other means], then there shall be an irrebuttable presumption that he is totally disabled due to pneumoconiosis . ”10 (“the irrebuttable presumption”). That is, requirements 2, 3, and 4 are deemed satisfied.
Also, “if a miner was employed for fifteen years or more in one or more underground coal mines, and if [a chest X-ray fails to meet the standards of the irrebuttable presumption], and if other evidence' demonstrates the existence of a totally disabling respiratory or pulmonary impairment, then there shall be a rebuttable presumption that such miner is totally disabled due to pneumoconiosis . ”11 (“the fifteen-year presumption”12). That is, re[?]*?quirements, 2, 3, and 4 may be deemed satisfied.
Finally, “if a miner who is suffering or suffered from pneumoconiosis was employed for ten years or more in one or more coal mines there shall be a rebuttable presumption that his pneumoconiosis arose out of such employment”13 (“the ten-year presumption”14). That is, requirement 4 may be deemed satisfied.15 The Regulation.
By regulation the Secretary has attempted to modify and restrict the statutory definition of “miner.” Where the statute speaks of an “individual who is or was employed in a coal mine,” the Secretary has substantially altered the phraseology to an “individual who is working or has worked as an employee.” 20 C.F.R. § 410.110(j) (1979) (emphasis added). Having introduced the word “employee,” which nowhere appears in the relevant portion of the statute, the Secretary has also prescribed that it refers to a “legal relationship under the usual common-law rules.” Id. § 410.110(m).16
The Facts.
The findings of the administrative law judge (“ALJ”) were adopted by the Secretary. The AU determined that claimant had years of work as a coal-mine employee, at least 7lk years of work in an unincorporated family coal mine of which he was part owner, and approximately 2 years of work in that mine after its incorporation.17 Thus, even if the work for the close corporation is treated as that of an employee under usual common law rules,18 of Moore’s conceded sixteen or more years of work in coal mines, less than ten years were as an employee as defined by the Secretary’s regulation. The ALJ, applying the definition contained in the regulation, refused Moore the benefit of any of the statutory presumptions.
The ALJ, considering a contention of Moore that, even without the benefit of the [912]*912presumptions he had established entitlement, found that, as of the relevant date for benefits, Moore had “a chronic respiratory or pulmonary impairment,” but that the preponderance of the medical information failed to meet Moore’s burden of proof regarding the existence of pneumoconio-sis.19 The ALJ further found that, even if Moore had shown the existence of pneumo-coniosis, he had not shown that that illness arose out of his activities as an employee. Because of the dusty conditions under which he worked in the family mine, “any pneumoconiosis which the claimant may establish could reasonably have arisen from his self-employed coal mining work . .
The district court, accepting without question the Secretary’s regulatory definition of a miner as an employee under usual common law rules, held that there was substantial evidence that claimant had less than ten years as an employee, and it ruled that the presumptions were unavailable to him. It further held that, because of his substantial exposure to coal dust in the family mine, he was unable to establish by other evidence that his respiratory condition, however severe it might be, arose out of activity as a coal mine employee. Accordingly, the court affirmed without reviewing the severity of Moore’s respiratory impairment.
Moore claims that for purposes of the ten- and fifteen-year presumptions, Congress did not authorize a distinction between self-employment in one’s own coal mine and wage labor in someone else’s coal mine, that “employment in a coal mine” or being “employed in a coal mine” were intended by Congress to refer simply to miners’ occupations and customary activities, not to who was the entrepreneur.
II
The regulation on its face accomplishes a change in the statutory language. As a simple matter of customary usage, one who is “employed” is not automatically or predominantly an employee.20 Since the regulation immediately generates a doubt as to whether it truly interprets the statute, our first task is to determine what Congress intended when it enacted the statute before us.21
[913]*913Although the isolated language the presumptions and of the definition of “miner” may be susceptible both to the Secretary’s interpretation and to the interpretation which Moore urges, the legislative history and statutory purpose of the provisions make abundantly clear that Congress intended to benefit all persons — those employed by third parties and self-employed persons alike — who had contracted a chronic dust disease of the lung as a result of their work in the nation’s coal mines.22 of
The Statutory Language.
The ease with which the statutory language supports the meaning which Moore urges is shown by the construction of the current version of the statute. In 1978, Congress amended the definition of “miner” 23 and made unmistakable its intent that self-employed miners be eligible for black lung benefits.24 The Secretary fully accepts that, under the current language of the Black Lung Benefits Act, self-employment in a coal mine counts toward the definitions of “miner” and “pneumoconio-sis” and toward the presumptions.25 That is, Moore’s suggested reading of the statute is accepted today notwithstanding that a miner’s work is referred to as “such employment,” 30 U.S.C.A. § 902(d) (West Supp. 1979), that pneumoconiosis still must arise out of “coal mine employment,” id. § 902(b), and that the rebuttable presumptions are still based on the miner’s having been “employed for [at least some period of time] in one or more” coal mines. Id. § 921(c)(1), (2), (4).
The expected reply of the Secretary, of course, is that self-employment now falls within those sections only because other evidence shows that the 1978 amendments were intended to make benefits available to qualifying self-employed miners. But im[914]*914plicit in that approach is the assumption that, before 1978, other evidence equally clearly established the opposite, namely that self-employment was not to count for purposes of qualifying for black lung benefits. Yet there is overwhelming evidence that in 1969 and 1972 Congress intended to benefit all persons who were totally disabled by pneumoconiosis as a result of coal mine work. Those constructions of “employed in” and “employment” which are correct to effect Congress’ 1978 wishes are also correct in light of, and are required by, earlier congressional intent as well.
The Secretary’s only evidence that “employed in” and “employment” as used in the statute referred to an employer-employee relation is very indirect and the argument is forced. For the other titles of the Federal Coal Mine Health and Safety Act of 196926 the definition of “miner” was “any individual working in a coal mine.”27 An individual engaged in coal mine activity works there as much if self-employed as he does if employed by another. The rebut-table presumption of formal consistency states that use of different language creates the inference that Congress meant different things.28 So the Secretary’s contention is that “employed in” must mean something other than “working in.”
However, where the statutory purpose and legislative history establish that no difference was in fact intended, the presumption is rebutted. Inadvertent statutory usage of synonyms in parallel sections does not require us to conjure up a distinction which would violate the statute's raison d’etre.29
Statutory Purpose and the Legislative History.
The act’s remedial purpose was to recognize the widespread incidence of pneumoco-niosis among American coal miners and to provide, on a national basis, alleviating compensation. A federal program was needed because in most instances workers’ compensation programs of the several states did not provide benefits. That consideration would, of course, be stronger, not weaker, in the case of the self-employed than in the case of those in a traditional common law employer-employee relationship.30 Nowhere in the legislative history is there any suggestion that a distinction should be drawn between miners in a formal employer-employee relationship to coal mine operators and the individual miner /operators of small mines whose working conditions were comparable to those of miners hired by larger mines. The legislative history contains no suggestion that the American enthusiasm for the sturdy, independent sole proprietor was waning to the point where he would be treated in a disadvantageous manner as compared with miners hired to work by larger operators. The difference between the definition of “miner” in the Black Lung Benefits Title and that applicable to the rest of the 1969 Act arose from the legislative decision to limit black lung benefits to those who actually had been engaged in underground coal mining activities and from the need for a defi[915]*915nition which would cover retired as well as active miners.31 Thus the special definition was inserted for purposes altogether independent of, and unrelated to, a distinction between “self-employed” and “employed by another.”
The members of Congress as the legislation made its way from introduction to enactment appeared to use interchangeably the phrases “was employed in a mine” and “worked in a mine.” For example, a frequently used32 summary of the conference committee’s version of the 1969 bill described one of the presumptions as follows: “If a miner worked ten years in [an underground coal] mine and died of a respirable disease, there will be a rebuttable presumption that his death was due to pneumoconio-sis.” The statute, however, happened to use “was employed . . . in” for this presumption.33 The “worked in” language for the presumption was also employed during debates by Representative Carl D. Perkins, one of the House conferees and the chairman of the House Committee on Education and Labor,34 and by Representative John H. Dent, another of the conferees and the chairman of that committee’s General Subcommittee on Labor.35
Even more to the point is the way the two phrases were indiscriminately used by those who created the fifteen-year presumption in 1972. The presumption was added to the House Bill, H.R. 9212, by the Senate Committee on Labor and Public Welfare and was then accepted by the full Senate and finally by the House. Although the presumption itself used “employed in” and “employment,” the Senate committee report tended to use “worked in” and “work”:
The bill . . establishes a rebut-table presumption that a totally disabled coal miner who worked in an underground mine for 15 years or a surface miner who was employed under environmental conditions similar to those experienced by underground miners, is totally disabled by pneumoconiosis if he has a totally disabling respiratory or pulmonary impairment, even if he has an X-ray which cannot be interpreted as positive for complicated pneumoconiosis. The Secretary of Health, Education and Welfare may rebut the presumption if . . . he establishes . . that the miner’s disability did not arise out of, or in connection with, his work in a coal mine.
The Committee intends that the burden will be placed on the claimant to prove the existence of pneumoconiosis in cases where the miner worked fewer than fifteen years in a coal mine, but that judgment will be allowed to be exercised in determining the validity of claims in such cases, including the determination that the miner’s disability is not due to pneu-moconiosis or that it is not related to his employment in a coal mine. A miner’s work history reflecting many years of mining work, though short of fifteen, and [916]*916the severity of his impairment, shall also be considered. .
It must be made clear by the Committee, however, that it expects and intends that miners with fewer than fifteen years in the mines who are totally disabled and who have X-ray evidence of pneumoconi-osis other than complicated pneumoconio-sis, who are now eligible for benefits, will remain so under the Committee amendments.36
Such random alternation is not the mark of legislators who intend to deny disability benefits on the basis of the distinction between “worked in” and “was employed in.”
The legislators who created the statute believed that it covered all individuals suffering from lung problems contracted in the coal mines.37 Opponents of the benefits program attacked it as discriminatory because it provided neither for miners disabled by other maladies nor for workers disabled by occupational lung diseases in other industries, but none of the opponents suggested that the program differentiated among victims of black lung disease itself on the basis of “self-employment” versus “employment by another.”38 In considering the target population for the benefit program, members of Congress frequently estimated that there were 100,000 victims of pneumoconiosis, of whom 50,000 were disabled.39 One hundred thousand was the figure given by the Surgeon General as the [917]*917total incidence of black lung in the United States.40
The Secretary’s predecessor contributed to Congress’ belief that all afflicted individuals were covered by the legislation in question. In 1972, nearly two years after the regulations we are considering had been promulgated, the Secretary’s predecessor wrote to the chairman of the Senate Committee on Labor and Public Welfare, “ ‘Employment in underground coal mines’ has been interpreted as work in an underground coal mine, whether below the surface performing functions in extracting the coal or above the surface at the mine preparing the coal so extracted.” 41 The Secretary stated that he favored continuation of the provisions restricting the program to underground miners. He characterized removing that restriction — removal which, despite the Secretary’s opposition, was effected in 1972,42 retroactive to 1969 — as “extension of Federal black lung benefits to all coal miners.”43
In oral argument, counsel for the Secretary tried to explain why Congress might have restricted benefits to miners employed by others. He suggested that perhaps Congress erroneously believed that all black lung sufferers had been employees. If Congress had had that mistaken belief and if in haec verba it had restricted benefits to “employees,” then perhaps only Congress could rectify the error. The error is highly unlikely, however, for Senators and Representatives from coal-mining states would surely have known their constituents well enough to appreciate that not all who mined coal did so wearing another’s collar. Congress had the manifest purpose of covering all victims, and where it used language which, without strained construction, extends to all victims, we find no justification for an alternate, improbable construction which would rely on a hypothesized congressional mistake and would substantially frustrate the statutory purpose.
Thus, a foundation was altogether lacking for the modification by the Secretary of the statutory language through insertion of the concept represented by the words “by another” after the word “employed.” Perhaps the then Secretary was influenced by the considerations that he was using the Social Security Administration to administer the black lung program and that, under the Black Lung Benefits Act, the standards for disability were to be no more restrictive44 than standards applicable under section 223(d) of the Social Security Act, 42 U.S.C. § 423(d). Social security law, by reason of its peculiar historical antecedents, does concern itself with the distinction between those in the common law employer-employee relationship and self-employed individuals, who pay different taxes to be eligible for social security benefits.45 However natural the employed-by-another construction may have seemed to persons steeped in the intricacies of the Social Security Act, the purposes of the black lung [918]*918benefits remedial legislation were quite different. Bureaucratic preference for distinctions long employed for other purposes by the bureaucracy may explain, but it does not justify, the modification of the statutory definition of a miner in a manner never intended by Congress. Indeed, that may be a kinder explanation than history would allow.46
Ill
Despite the clear indications of congressional intent in 1969 and 1972 to cover all victims of black lung, the Secretary, to justify the unduly restrictive definition of miner for purposes of eligibility for black lung benefits, points to events since 1969 which, she says, contradict the intent and which, therefore, should bar us from giving effect to the intent. The events may be grouped as administrative, judicial, and legislative interpretations of the act.
Administrative Interpretation.
The administrative interpretation is, of course, the Secretary’s own when in 1970 the then Secretary promulgated the regulations whose validity is at issue in this case. However, recourse to administrative interpretation as an aid in ascertaining legisla-five intent occurs only when there is ambiguity in the statute.47 There was no ambiguity. Having determined that the preferred meaning of the language used in the statute and the clear intent of Congress in 1969 coincide, we consider the administrative interpretation as clearly wrong and, therefore, not persuasive.
The statute gave the Secretary explicit authority “to issue such regulations as [he] deems appropriate to carry out the provisions of [the Black Lung Benefits Act],” 30 U.S.C. § 936(a) (1976). If, arguendo, Congress thereby entrusted the Secretary with primary responsibility for interpreting all statutory terms, the regulation in question would be “entitled to more than mere deference or weight. It [could] be set aside only if the Secretary exceeded his statutory authority or if the regulation is ‘arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with the law.’ 5 U.S.C. §§ 706(2)(A), (C).” Batterton v. Francis, 432 U.S. 416, 426, 97 S.Ct. 2399, 2406, 53 L.Ed.2d 448 (1977).
Even such delegation, however, does not free courts from their responsibilities to say what the law is and to determine [919]*919whether the regulation in question is consistent with the law. “What Congress has given the Secretary may not take away.” Bozwich v. Mathews, 558 F.2d 475, 480 (8th Cir. 1977).
Thus, despite express delegation to prescribe standards for determining what constitutes one of the requirements for benefit eligibility, “the Secretary’s authority to prescribe standards is not unlimited. [Sh]e could not, for example, adopt a regulation that bears no relationship to any recognized concept of [the requirement in question] or that would defeat the purpose of the [benefit] program.” Batterton v. Francis, 432 U.S. at 428, 97 S.Ct. at 2407. Accord, United States v. Larionoff, 431 U.S. 864, 873, 97 S.Ct. 2150, 2156, 53 L.Ed.2d 48 (1977):
[Regulations, in order to be valid, must be consistent with the statute under which they are promulgated.12
Judicial Interpretation.
The Secretary next turns to court cases which applied her regulation and its definition of employment as excluding self-employment. Ball v. Mathews, 563 F.2d 1148 (4th Cir. 1977), contained dicta in which the court without discussion accepted the Secretary’s interpretation. Ball’s holding, however, was that, notwithstanding that interpretation, the claimant met the ten-year presumption test. Such reference to the Secretary’s definition, when doing so did not affect the outcome of the case, does not bar us now from questioning the regulation’s validity, when the answer to the question makes a difference. Conversely, in Neese v. Califano, 594 F.2d 985 (4th Cir. 1979), the regulation’s invalidity might have mattered, but neither the parties nor the court addressed the issue. See 9 J. Moore, B. Ward, & J. Lucas, Moore’s Federal Practice 1228.02[2 — 1], at 28-7 (2d ed. 1980) (“[N]ormally the court will not consider issues that are not . . . raised and argued [in the appellant’s initial brief].”); Virginians for Dulles v. Volpe, 541 F.2d 442, 444 (4th Cir. 1976).
In Montel v. Weinberger, 546 F.2d 679 (6th Cir. 1976), the majority rejected the contention that working for a closely held family corporation constituted “employment” as the Secretary had defined it. The majority opinion contains the flat assertion: “We believe the Secretary’s definition is consistent with the language of the act.” 546 F.2d at 681. So it may be, if an alternate meaning for the operative word “employment” is adopted, but it is utterly inconsistent with the act’s history and purpose. As Judge McCree’s dissent indicates, the problem on which the court focused was the propriety vel non of treating employment by a close corporation as indistinguishable from self-employment. Not concentrating on the question of the validity of the Secretary’s regulation, the Montel court reached a conclusion on that point with which we must respectfully disagree.
Other cases in which the Secretary’s definition has been uncritically accepted without investigation of the plain meaning of the statutory language and of the legislative history are Fleming v. Weinberger, 412 F.Supp. 293 (W.D.Va.1975); Weaver v. Weinberger, 392 F.Supp. 721 (S.D.W.Va. 1975); Markosky v. Mathews, 435 F.Supp. 374 (E.D.Pa.1977); Yenetskie v. Secretary of HEW, 426 F.Supp. 1372 (E.D.Pa.1977); and Braden v. Mathews, 407 F.Supp. 1032, 1034 (E.D.Tenn.1976), aff’d mem., 559 F.2d 1219 (6th Cir. 1977). In our view, they are not persuasive authority for the reasons we have outlined in declining to follow Montel.
Legislative Interpretation.
Finally, the Secretary relies on congressional action in 1972 and 1978 as confirming the accuracy of her perception of the 1969 legislative intent. In 1972, distressed by the rate at which the Secretary was deny[920]*920ing benefits under the 1969 act,48 Congress liberalized many provisions of the act and made the liberalized provisions retroactive to December 30, 1969.49 Among the 1972 changes were the introduction of the fifteen-year presumption50 and an amendment to the definition of “miner” in 30 U.S.C. § 902(d) which substituted “a coal mine” for “an underground coal mine.”51 Since in 1970 her predecessor had promulgated the regulation with the requirement that “miners” be “employees,”52 the Secretary may point to the 1972 action by Congress as a statutory reenactment which adopted the extant administrative interpretation.
Although reenactment may be “persuasive evidence that the [administrative] interpretation is the one intended by Congress,” NLRB v. Bell Aerospace Co., 416 U.S. 267, 275, 94 S.Ct. 1757, 1762, 40 L.Ed. 2d 134 (1974), that evidence is subject to rebuttal. As Professor Davis put it, “[T]he committees or subcommittees of Congress may or may not know of outstanding interpretations when they are considering reenactment; they do not in fact approve what they know nothing about.”53
Moreover, the Supreme Court has stated, “Where the law is plain the subsequent reenactment of a statute does not constitute adoption of its administrative construction.” Biddle v. Commissioner, 302 U.S. 573, 582, 58 S.Ct. 379, 383, 82 L.Ed. 431 (1938). For instance in SEC v. Sloan, 436 U.S. 103, 119-21, 98 S.Ct. 1702, 1712-13, 56 L.Ed.2d 148 (1978), the act before the Court had been re-enacted several times, the administrative interpretation in question had been mentioned at congressional hearings, and at least one congressional committee had filed a report explicitly approving the practice at issue. Notwithstanding the evidence of congressional awareness, the Court held that, even under those circumstances, reenactment did not constitute adoption of the interpretation. “The absence of any truly persuasive legislative history to support the [administrative interpretation], and the entire statutory scheme suggesting that in fact the [interpretation is wrong], reinforce our conclusion . . . .” 436 U.S. at 122-23, 98 S.Ct. at 1714.
In the instant case, when the Secretary’s predecessor sent his letter dated February 15, 1972, to the chairman of the Senate Committee on Labor and Public Welfare, the letter may have misled Congress about the substance of the extant administrative interpretation. The letter discussed both the pre-1972 law and the proposed amendment as if there were no employee-status requirement. See notes 41, 43, supra. Although Senator Randolph during a committee hearing once mentioned the Secretary’s requirement,54 no other legislator or witness even alluded to that requirement, either during committee hearings55 or on the floor of either house of Congress.56 It is at least [921]*921as likely as not, therefore, that the action of Congress in reenacting the language to which the Secretary’s interpretation attached was in part the result of reliance on the Secretary’s misleading communication.57
Given the unambiguous legislative history of, and statutory purpose behind, the Black Lung Benefits Act, the argument is even stronger here than in Sloan for holding that reenactment did not constitute adoption of extant but obscure administrative constructions. When Congress remedies some administrative misinterpretations of an existing statute, it does not act at the risk of barring courts from correcting other misinterpretations on which Congress does not then focus its attention. Legislators who believed that they were expanding the availability of benefits will not be deemed by us to have narrowed them. Judge Learned Hand has said in the context of the same tax statute construed by Biddle:
To suppose that Congress must particularly correct each mistaken construction under penalty of incorporating it into the fabric of the statute appears to us unwarranted; our fiscal legislation is detailed and specific enough already. While we are of course bound to weigh seriously such rulings, they are never conclusive; here, it seems to us that they are not enough to turn the scale.
F.W. Woolworth Co. v. United States, 91 F.2d 973, 976 (2d Cir. 1937), cert. denied, 302 U.S. 768, 58 S.Ct. 479, 82 L.Ed. 597 (1938).
As her last shot, the Secretary puts forth the contention that, in 1978, when Congress clearly included self-employed miners among the beneficiaries of the act,58 the Committee reports treated that inclusion as an expansion of the act’s coverage, rather than as a correction of a prior administrative misinterpretation.59
This, of the Secretary’s three interpretation arguments, is the one with the most force. While a later Congress cannot dictate what was meant by an earlier Congress, its understanding as to what was meant should be accorded substantial deference by the courts.60 But it is the intent of the earlier Congress, which enacted the [922]*922statute, that controls.61 In the instant case, we regard the committees’ subsequent interpretation of the 1969 act as inconsistent with the clear 1969 statutory purpose and history. To the extent a later Congress erred, the error was induced by the Secretary’s regulatory definition62 and by some courts’ uncritical application of the definition. The main purpose of Congress in 1978 was to insure that benefits would no longer be denied because part or all of a miner’s activities had been in “self-employment. It was interested in curing a situation for the future and not in apportioning blame by ascertaining whether the situation arose as a result of misinterpretation of the earlier statute or as a result of inadequacy of the earlier statute. The clear meaning of the 1969 statute itself suffices to outweigh anything a congressional committee could have said in later years.
For this court, on the other hand, the question of the origin of the exclusion of self-employment is the crucial one. With all deference to the Ninety-Fifth Congress, we adhere to our conclusion that the 1969 statute enacted by the Ninety-First Congress was misinterpreted, first administratively, then judicially, and finally legislatively.
IV
Accordingly, we reverse and remand with instructions that the district court order the Secretary to make her findings giving the claimant the benefit of presumptions deriving from over fifteen years of coal mine employment.
REVERSED AND REMANDED.