Rich, Judge,
delivered the opinion of the court:
DeWalt, Inc. applied for registration on the Principal Register of the words “Power Shop” as a trademark for woodworking saws, application Ser. No. 14,135 filed August 17,1956. The original applicant was a Pennsylvania corporation, now replaced through mesne assignments by a Delaware corporation of the same name. Use since February 10,1953, was claimed, which date applicant sought to amend to “at least as early as October 10,1949.”
Notice of opposition to the registration was filed February 25,1957, by Magna Power Tool Corporation, a corporation of California, as maker and seller of the “Shopsmith,” 2 a multiple-purpose power tool, claiming prior and extensive use in a descriptive sense of the words “power shop.” Paragraph 5 of the Notice of Opposition reads:
The term “Power Shop” in connection with woodworking saws and woodworking shops has a common accepted meaning both in the trade and to the public, viz., a shop or workshop in which the tools are power tools rather than hand tools. Woodworking saws are commonly found in such power shops.
Opposer asserts it would be damaged by the registration because, as applied to woodworking saws, “Power Shop” is a common, descriptive, generic term the registration of which would be a threat to op-poser, its customers, or any other member of the public selling power tools similar to those of the parties, since it would make possible harassment by litigation based on the registration. It was further alleged that registration would be contrary to sections 2(e) and 2(f) of the Trademark Act of 1946 and in derogation of prior rights of the op-poser and of all others similarly situated.
The basic “Shopsmith” tool, for which an extensive line of accessory tools is sold, is a combination shop tool, as distinguished from a hand tool, powered by a substantial electric motor and capable, by various [913]*913adjustments or conversions, of serving as a vertical drill press, a table saw, a lathe, a disc sander, or a horizontal drill press, all intended primarily for use in woodworking. It is five feet long and weighs over 200 pounds. By substituting various tools it can also be used for grinding, buffing, mortising, jointing and shaping. An advertising piece attached to the Notice of Opposition shows that this tool was promoted by use of the prominent, and we may say apt, phrase “THE Complete POWER SHOP in ONE TOOL.”
The woodworking saw sold by DeY/alt, in connection with which it has employed the designation “Power Shop,” is a competitive item in a similar price range. Technically it is known as a radial-arm saw and is the smallest member of a line of such saws sold by DeWalt which have ranged from one-half to fifteen horsepower. The smallest member, which was originally a half horsepower model but which has been constantly increased in power, commenced its market career some time prior to 1948 as the “Moto-Miter Box.” In 1949 Mr. Dudley, a district manager of DeWalt on the West coast, got the idea of promoting the “Moto-Miter Box,” theretofore sold primarily to building contractors, to the home workshop market through hardware and department stores. Since he disliked the name “Moto-Miter Box” and considered it unsuitable for use in connection with such a promotion, he selected the name “Power Shop,” persuaded the company to adopt it, and the term “Power Shop” has ever since been used in connection with the small DeWalt saw. That designation has appeared in many different forms and, if we may be permitted to judge from what we can see in the current daily papers, the form of use is still undergoing changes. But from the record we may say that the two words “power shop” have sometimes been in larger type than “DeWalt” and sometimes smaller. They have been used in single quotes, double quotes, and without quotes. They have sometimes been used in such manner as in no way to distinguish them from other descriptive terminology. On the whole record, however, there seems to have been substantial use of the words as a trademark; or at least it is clear DeWalt attempted to make a trademark use of them.
Like “Shopsmith,” the “DeWalt Power Shop” has been promoted as a multiple-purpose tool. One piece of literature, copyright 1949, calls it the “machine of 1001 uses” (initially 101 uses, which was felt to be too modest) and specifies the "following ten main categories: tilting arbor saw, cut-off saw, dado machine, shaper, router, tenoner, sander, horizontal drill, grinder, and metal cutter. By using other attachments which DeWalt sells as accessories, still other functions can be performed.
[914]*914The general factual background of the issues here may be summed up as follows: Commencing at about the same time in 1949, the applicant, DeWalt, and opposer, Magna, have both used the words “power shop” in connection with the sale of multiple-purpose power tools which are basically woodworking saws. DeWalt, after using these words in a variety of ways for about seven years, decided to-register them as a trademark. Magna, after using the identical words-to describe its “Shopsmith,” making no claim to any trademark rights-in the words “power shop,” opposes the registration because it considers that the registration may interfere with a continuation of the descriptive use it has been making of those words over a long period of time.
As might be expected, the parties take up diametrically opposed positions, Magna claiming that the words “power shop” are wholly descriptive of power saws and DeWalt insisting that they are not and saying that even if they are, they have become distinctive of its-goods through long use and substantial advertising which has given them a secondary meaning. As is so frequently the case, the truth of the matter appears to lie somewhere in between.
There is also a dispute as to which party was the first to use “power shop” in its promotion of saws but in the view we take of the case this question of priority is of no legal significance.
The Trademark Trial and Appeal Board sustained the opposition* holding Magna to be a prior user by reason of published advertising in September 1949, whereas DeWalt’s proofs did not satisfactorily establish a date earlier than October 9, 1949.3 As noted above, the priority issue is a close one, both parties having started use about the same time. But since this is not a dispute over which of two claimants is entitled to a trademark on the basis of priority, it is our view that priority is not the determining factor.
The board did not rule specifically on the question whether “Power Shop” is a descriptive term, for which reason DeWalt says that that issue was never reached by the board. The board did, however, make the following statement from which we think it may reasonably be inferred that the board did consider the term to be descriptive:
* * * opposer and its franchised dealers have, since September, 1949, and at considerable expense, continuously and extensively advertised its “Shopsmith” tool through newspapers, nationally distributed consumer and trade publications, and other media, and have consistently used the term “Power Shop” and/or “Power Work Shop” in its advertising copy to describe its product. [Emphasis ours.]
[915]*915Our review of the record shows the foregoing statement of fact to be well supported.
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Rich, Judge,
delivered the opinion of the court:
DeWalt, Inc. applied for registration on the Principal Register of the words “Power Shop” as a trademark for woodworking saws, application Ser. No. 14,135 filed August 17,1956. The original applicant was a Pennsylvania corporation, now replaced through mesne assignments by a Delaware corporation of the same name. Use since February 10,1953, was claimed, which date applicant sought to amend to “at least as early as October 10,1949.”
Notice of opposition to the registration was filed February 25,1957, by Magna Power Tool Corporation, a corporation of California, as maker and seller of the “Shopsmith,” 2 a multiple-purpose power tool, claiming prior and extensive use in a descriptive sense of the words “power shop.” Paragraph 5 of the Notice of Opposition reads:
The term “Power Shop” in connection with woodworking saws and woodworking shops has a common accepted meaning both in the trade and to the public, viz., a shop or workshop in which the tools are power tools rather than hand tools. Woodworking saws are commonly found in such power shops.
Opposer asserts it would be damaged by the registration because, as applied to woodworking saws, “Power Shop” is a common, descriptive, generic term the registration of which would be a threat to op-poser, its customers, or any other member of the public selling power tools similar to those of the parties, since it would make possible harassment by litigation based on the registration. It was further alleged that registration would be contrary to sections 2(e) and 2(f) of the Trademark Act of 1946 and in derogation of prior rights of the op-poser and of all others similarly situated.
The basic “Shopsmith” tool, for which an extensive line of accessory tools is sold, is a combination shop tool, as distinguished from a hand tool, powered by a substantial electric motor and capable, by various [913]*913adjustments or conversions, of serving as a vertical drill press, a table saw, a lathe, a disc sander, or a horizontal drill press, all intended primarily for use in woodworking. It is five feet long and weighs over 200 pounds. By substituting various tools it can also be used for grinding, buffing, mortising, jointing and shaping. An advertising piece attached to the Notice of Opposition shows that this tool was promoted by use of the prominent, and we may say apt, phrase “THE Complete POWER SHOP in ONE TOOL.”
The woodworking saw sold by DeY/alt, in connection with which it has employed the designation “Power Shop,” is a competitive item in a similar price range. Technically it is known as a radial-arm saw and is the smallest member of a line of such saws sold by DeWalt which have ranged from one-half to fifteen horsepower. The smallest member, which was originally a half horsepower model but which has been constantly increased in power, commenced its market career some time prior to 1948 as the “Moto-Miter Box.” In 1949 Mr. Dudley, a district manager of DeWalt on the West coast, got the idea of promoting the “Moto-Miter Box,” theretofore sold primarily to building contractors, to the home workshop market through hardware and department stores. Since he disliked the name “Moto-Miter Box” and considered it unsuitable for use in connection with such a promotion, he selected the name “Power Shop,” persuaded the company to adopt it, and the term “Power Shop” has ever since been used in connection with the small DeWalt saw. That designation has appeared in many different forms and, if we may be permitted to judge from what we can see in the current daily papers, the form of use is still undergoing changes. But from the record we may say that the two words “power shop” have sometimes been in larger type than “DeWalt” and sometimes smaller. They have been used in single quotes, double quotes, and without quotes. They have sometimes been used in such manner as in no way to distinguish them from other descriptive terminology. On the whole record, however, there seems to have been substantial use of the words as a trademark; or at least it is clear DeWalt attempted to make a trademark use of them.
Like “Shopsmith,” the “DeWalt Power Shop” has been promoted as a multiple-purpose tool. One piece of literature, copyright 1949, calls it the “machine of 1001 uses” (initially 101 uses, which was felt to be too modest) and specifies the "following ten main categories: tilting arbor saw, cut-off saw, dado machine, shaper, router, tenoner, sander, horizontal drill, grinder, and metal cutter. By using other attachments which DeWalt sells as accessories, still other functions can be performed.
[914]*914The general factual background of the issues here may be summed up as follows: Commencing at about the same time in 1949, the applicant, DeWalt, and opposer, Magna, have both used the words “power shop” in connection with the sale of multiple-purpose power tools which are basically woodworking saws. DeWalt, after using these words in a variety of ways for about seven years, decided to-register them as a trademark. Magna, after using the identical words-to describe its “Shopsmith,” making no claim to any trademark rights-in the words “power shop,” opposes the registration because it considers that the registration may interfere with a continuation of the descriptive use it has been making of those words over a long period of time.
As might be expected, the parties take up diametrically opposed positions, Magna claiming that the words “power shop” are wholly descriptive of power saws and DeWalt insisting that they are not and saying that even if they are, they have become distinctive of its-goods through long use and substantial advertising which has given them a secondary meaning. As is so frequently the case, the truth of the matter appears to lie somewhere in between.
There is also a dispute as to which party was the first to use “power shop” in its promotion of saws but in the view we take of the case this question of priority is of no legal significance.
The Trademark Trial and Appeal Board sustained the opposition* holding Magna to be a prior user by reason of published advertising in September 1949, whereas DeWalt’s proofs did not satisfactorily establish a date earlier than October 9, 1949.3 As noted above, the priority issue is a close one, both parties having started use about the same time. But since this is not a dispute over which of two claimants is entitled to a trademark on the basis of priority, it is our view that priority is not the determining factor.
The board did not rule specifically on the question whether “Power Shop” is a descriptive term, for which reason DeWalt says that that issue was never reached by the board. The board did, however, make the following statement from which we think it may reasonably be inferred that the board did consider the term to be descriptive:
* * * opposer and its franchised dealers have, since September, 1949, and at considerable expense, continuously and extensively advertised its “Shopsmith” tool through newspapers, nationally distributed consumer and trade publications, and other media, and have consistently used the term “Power Shop” and/or “Power Work Shop” in its advertising copy to describe its product. [Emphasis ours.]
[915]*915Our review of the record shows the foregoing statement of fact to be well supported. The principal facts to be taken into account are that nearly four million copies of a circular were distributed during the years 1949-1953 which described the “Shopsmith” and had on its cover in bold type the phrase “THE Complete POWEB SHOP in ONE TOOL.” The same slogan or descriptive phrase appeared in many advertisements and on a thousand point of sale panels which were set up as “Shopsmith” displays in stores from coast to coast. Other similar expressions used in 1949 and 1950 in national advertising were such as “All-Purpose, Farm-Fitted Power Shop,” “heavy-duty power ■shop,” “the complete power shop in one unit,” and “complete power workshop.” We consider “power shop” simply a short form of “power workshop.” All of this extensive use occurred before DeWalt made application to register “Power Shop.”
On the basis of the foregoing there can be no question but that “power shop” as used ~by Magna in its “Shopsmith” promotion was used descriptively. On this basis it can be said to be “descriptive.” The phrases in which use occurred make sense.
On the other hand, apart from Magna’s use, it is not self-evident that the term “power shop” is descriptive of a saw. There is merit to DeWalt’s argument that a “shop” is a place not a tool, and that a saw is not a shop. We also agree that it is not at all necessary to use the term “power shop” to describe either Magna’s multi-purpose tool, the unique “Shopsmith,” or DeWalt’s radial-arm power saw. In a certain context “power shop” may have a clear descriptive connotation but in another context it becomes merely suggestive of the great usefulness and versatility of some machine or other which it wholly fails to “denominate,” as appellant says. This poses something of a dilemma.
DeWalt may very well have some enforceable common law trademark rights in “PoAver Shop” by reason of its use and advertising of the term; but those rights, whatever they are, cannot be such as to enable it to require opposer to stop using the identical term in a descriptive manner. It is not our task, however, to pass on those rights in this proceeding. The only issue here is the narrower statutory issue of registrability under the Trademark Act of 1946 and to that issue we necessarily confine our decision.
The first step toward that decision is our conclusion that where opposer is not claiming trademark rights but merely freedom to continue a descriptive use, the situation must be judged and the right to registration decided on the basis of the factual situation as of the time when registration is sought. Begistration in this case was not applied for until August 17, 1956, by which date Magna had been plugging its “Shopsmith” as a “complete power shop in one tool” for [916]*916nearly seven years. Regardless of whether “power shop”, prior to such use, was descriptive of woodworking power saws, that promotion certainly gave the term a descriptive significance in the very market where DeWalt’s radial-arm saw is being sold.
Trademark rights are not static. A word or group of words not descriptive today may, through usage, be descriptive tomorrow. And, conversely, as is recognized in section 2 (f), the possibility always exists, with respect to words capable of distinguishing an applicant’s goods in commerce, that descriptive words may become registrable trademarks. It is for this reason that we are considering the situation as of 1956 and disregarding the dispute over priority.
On the record here we feel constrained to hold that “Power Shop” falls within the prohibition of section 2(e) which prevents the registration of a mark which, “when applied to the goods of the applicant is merely descriptive.” We deem the goods of the parties before us to be identical so far as trademark law is concerned. If “power shop” is an apt term to describe opposer’s goods, then it is just as descriptive of applicant’s goods. The evidence in the case is more than sufficient to show that the “Shopsmith” is appropriately called a “power shop” or “power workshop” because possession of this tool and its accessories actually provides one with a power shop for woodworking. So does ownership of a DeWalt saw and its accessories. But this, alone, is not dispositive of the case.
DeWalt argues that even if the position we have taken as to descriptiveness is correct, Magna could not be damaged by registration of “Power Shop” to DeWalt because the term “could be registered under Section 2(f) in any event.” As hereinafter explained, this is a non sequitur. At the same time DeWalt insists that its application is not made “under” that section and seems to regard registration “under 2(f) ” only as a future possibility.
We do not know any reason why DeWalt should be confident of registrability under section 2(f). That section does not say when any mark shall be registrable. It merely provides, as to marks which have “become distinctive of the applicant’s goods in commerce,” that “nothing herein shall prevent the registration” and states one ground on which the Commissioner is authorized to find that distinctiveness of the mark has been prima facie established. That one ground requires that the applicant’s use shall, inter alia, have been “substantially exclusive.” This would seem to be an impossibility in view of Magna’s millions of competitive and continuing uses of “power shop.”
In any event there is no logic in DeWalt’s argument. Even if DeWalt were consciously asserting a right to registration “under [917]*917Section 2(f),” registration could not be granted without considering whether it would be damaging to opposer.
It is not altogether clear, furthermore, what DeWalt means when it says its application is not made under section 2(f) for a page later it is asserting that “Power Shop” is “distinctive within the meaning of Section 2 (f). The proof of secondary meaning is clearly adequate.” We suppose the “proof” referred to is the evidence in the record before us and our understanding of present practice is that no more is necessary to bring an application “under section 2(f)” than the assertion that the mark is registrable by reason of its having become distinctive. See Trademark Rules of Practice, (1959) Rule 2.41 and form 4.1, note 4. In any event, we treat the application, and the applicant, on the basis that registrability is urged by reason of an established “secondary meaning” in the term “Power Shop” because of which it is alleged to distinguish the applicant’s goods in commerce. So considering it does not lead us to any different conclusion.
When the statute, section 13, says that a person who “believes he would be damaged by the registration of a mark” may oppose registration, we take it to mean that if we find clear possibility of damage to established rights of an opposer which are entitled to legal protection, then we shall sustain the opposition. We assume an opposition could not be won by showing only damnum absque injuria. In this case we think registration might well be damaging to pro-teetible rights of opposer.
We find that Magna has a long established right to use “power shop” descriptively and prominently in connection with the sale of woodworking saws and it would be inconsistent to register “Power Shop” to DeWalt for those wares because to do so would give it the benefit of section 7(b). That section provides that registration on the Principle Register is prima facie evidence of the registrant’s “exclusive right to use the mark in commerce in connection with the goods.” The goods are power saws. The “mark” consists of the two words “Power Shop.” Implicit in an “exclusive right” to use is the right to exclude others. DeWalt does not have the right to exclude Magna from the use of the words “power shop.” To put it in possession of prima facie proof of a right it does not have, which it might at any time decide to assert against Magna, would, in our opinion, be damaging to Magna since it could at least be used to harass Magna into ceasing the use of “power shop” on pain of defending a lawsuit. Moreover, the outcome of such a suit is far from certain.
[918]*918This court, since the earliest days of its jurisdiction over Patent Office appeals, had adhered to the then already established principle that damage to an opposer or injury to a petitioner for cancellation— Those being the terms of the old law now replaced in the Lanham Act iby “damage” in either situation — will be presumed or inferred when "the mark sought to be registered is descriptive of the goods and the «opposer or petitioner is one who has a sufficient interest in using the descriptive term in its business. California Cyanide Co. v. American Cyanamid Co., 17 CCPA 1198, 40 F.2d 1003, 5 USPQ 480 (“Calcyanide”), Model Brassiere Co., Inc., v. Bromley-Shepard Co., Inc., 18 CCPA 1294, 49 F.2d 482, 9 USPQ 238 (“ensemble”), United Shoe Machinery Corp. v. Compo Shoe Machinery Corp., 19 CCPA 1009, 56 F.2d 292, 12 USPQ 246 (“compo”), Martell & Co. v. Societe Anonyme de la Benedictine, etc., 28 CCPA 851, 116 F.2d 516, 48 USPQ 116 (“B and B”), Burmel Handkerchief Corp v. Cluett, Peabody & Co., Inc., 29 CCPA 1024, 127 F.2d 318, 53 USPQ 369 (“Handkerchiefs of the Year”), Meehanite Metal Corp. v. The International Nickel Co., Inc., 46 CCPA 765, 262 F.2d 806, 120 USPQ 293 (“spherulite”), J. Kohnstam, Ltd. v. Louis Marx & Co., Inc., and Linemar Co., Inc., 47 CCPA 1082, 280 F.2d 437, 126 USPQ 362 (“matchbox”).
Relatively few of the proceedings in which the applicability of the foregoing principle is involved reach this court so we do not often have occasion to apply it. In the Patent Office, however, its application appears to have become routine where opposition is made to the registration of descriptive terms, the reason for presuming damage sometimes being stated as potential interference with opposer’s rights predicated on the statutory rights flowing from the registration. We note with approval the following decisions presuming or inferring damage within the past three years: The Borden Co. v. G. P. Gundlach & Co., Inc., 117 USPQ 102, (“Dutch Apple”), Wenham Supply Company v. Contour Truck Guards, Inc., 119 USPQ 302, (“contour”), Bendix Aviation Corporation v. Westinghouse Electric Corporation, 120 USPQ 230, (“magamp”), Koppers Company, Inc., v. Allgemeine Holzimpragnierung Dr. Wolman, 120 USPQ 236, and 124 USPQ 114 (“thanalalith”), Meyers Bros., v. System Auto Parks, Inc., 120 USPQ 238, (“system”), Wilco Company v. Spray Products Corporation, 121 USPQ 277, (“65° below zero”), Batori Computer Company, Inc. v. Weems System of Navigation, 121 USPQ 280 (“Mark II”), Re-Ward Ceramic Color Mfrs., Inc., v. Robert R. Umhoefer, Inc., 121 USPQ 606, (“One Stroke”), Jones & Laughlin Steel Corporation v. Bliss & Laughlin, Incorporated, 122 USPQ 282, (“strain tempered”), Wyzenbeek & Staff, Inc. v. Speedway, 122 USPQ 580 (“speed saw”), and Massey-Ferguson Inc. v. Sperry Rand Corporation, 125 USPQ 316, (“hay-in-a-day”). By way of contrast we note the following two cases [919]*919in which the principle was not applied because the term sought to be registered, through comprising words capable of descriptive use, was held not to be “descriptive” of the goods within the meaning of the statute: A. B. Dick v. Whitin Machine Works, 118 USPQ 380, (“Masterlith” opposed by supplier of materials for making lithographic masters), and Knomark Manufacturing Company, Inc., v. The Rapp-Ramsey Company, 120 USPQ 338, (“Shine” for household cleanser opposed by shoe-polish manufacturer). The last two cases well illustrate where the line is drawn. But here we hold “Power Shop” to be “descriptive” and damage from the registration, consistently with all of the foregoing decisions, is to be presumed. Stare decisis would be a sufficient reason but aside from legal technicalities the rule is based on very practical considerations. The evidentiary value of a Principal Register registration under Section 1 (b) of the statutes makes it a potent weapon in litigation and this, plus the respect in which business men hold certificates of Federal registration, makes such a registration an encouragement to suits and other types of harassment which would be much less likely to occur in its absence.
To summarize: “Power Shop” is descriptive under section 2(e) because through Magna’s use the term had become descriptive of the goods here involved long prior to DeWalt’s application to register. Section 2(f) is not a provision that every descriptive term which acquires a de facto secondary meaning becomes registrable automatically.4 Some descriptive words may become registrable when no conflicting rights are asserted. “Power Shop” appears to be such a term. While section 2(f) opens to the applicant the possibility of establishing registrability notwithstanding 2(e), here the proof by opposer of its conflicting right to use the mark prevents its registration. We agree with opposer that registration would be a threat to it and its customers, would make harassment possible, and would be in derogation of opposer’s established rights.
In this situation we wish it to be clear that we are voicing no opinion on the applicant’s right to prevent infringement by others of whatever trademark rights — as distinguished from registration rights — it may have, insofar as it may be able to establish those rights without the aid of a registration.
For the foregoing reasons the decision of the board sustaining the opposition must be affirmed. One further procedural matter remains.
[920]*920A motion lias been made in this court that Yuba Consolidated Industries, Inc., a Delaware corporation, be substituted for the original opposer, Magna Power Tool Corporation. It appears that Magna changed its name to Yuba Power Products, Inc., and, under the latter name, then transferred all of its assets to the corporation sought to be substituted, the latter being the owner of all of the stock of the transferor. DeWalt has argued that the substitution should not be made but after careful consideration, we see no good reason for not permitting it. The corporation to be substituted appears to be the sole party interested in selling the “Shopsmith,” in connection with which the words “power shop” have been used. There is no showing that this business is not a continuing one. The motion to substitute is granted.
Worley, C. J., concurs in the result.