WEICK, Circuit Judge.
This is an interlocutory appeal from an order of the United States District Court for the Northern District of Ohio denying a motion by Skil Corporation (Skil) to remand a patent infringement action to the District Court in Northern Illinois, which had previously transferred the case to the Ohio Court under the provisions of 28 U.S.C. § 1404(a).
The transferred case is one of several which have been filed during protracted litigation between Skil and Lucerne Products, Inc. (Lucerne), who are the patentees and manufacturers of competing switches used on portable electric tools. This litigation has been pending in various courts since 1968, with cases filed not only in Ohio and Illinois, but also in the Southern District of New York and the District of Connecticut.
Over the years cases have shuttled between the District Courts of Northern Ohio and Illinois by transfer and retransfer in a controversy over choice of forum, with the result that there has been no trial on the merits of the litigation. Various phases of the transfer litigation have been considered by District Judges Green and Lambros of Ohio, and by Judges Will and Hoffman of Illinois. This is the fourth appeal which our court has entertained.1
The history of the litigation is detailed in Judge Hoffman’s transfer order, a copy of which is appended hereto as Exhibit “A”.
[556]*556Skil filed this particular action in the Northern District of Illinois against several of Lucerne’s customers. Lucerne had indemnified its customers, and was permitted to intervene as a defendant. Skill was also plaintiff in an action against Lucerne then pending in the Northern District of Ohio, No. C 69-461, which raised the same issues of patent validity. Judge Hoffman sua sponte ordered this action transferred to the Northern District of Ohio so that it could be consolidated with Skil’s action against Lucerne.
Upon the entry of the transfer order Skil filed an Emergency Petition for a Writ of Mandamus and Prohibition in the Court of Appeals for the Seventh Circuit, seeking to vacate Judge Hoffman’s order. The basis of the attack was that the record did not show that the transferee court had proper venue as to each defendant, that one of the defendants did not have a principal place of business in Northern Ohio, and that therefore Judge Hoffman was without power to order the transfer under § 1404(a). The petition with a brief and attachments thereto consisted of 123 pages, and a supplemental appendix was filed. Lucerne filed an 80-page response.
Circuit Judges Kiley, Stevens and Sprecher considered the merits of the case, as evidenced by the following order entered on December 26, 1973:
This matter is before the court on the filing by each party of a communication, as required by this court’s order of September 6, 1973, advising the court of the disposition of the appeal in No. 73-1738 docketed in the United States Court of Appeals for the Sixth Circuit. On consideration of the plaintiff’s emergency petition for writ of prohibition and mandamus, memorandum in support thereof, and supplemental appendix filed August 2, 1973 and of joint answer of respondents filed August 22, 1973,
It is ordered that said petition be, and the same is hereby DENIED. (App. I at 255)
The Seventh Circuit denied Skil’s petition for rehearing and another petition for rehearing en banc; it denied Skil’s motion for a stay pending certiorari to the Supreme Court. Mr. Justice Rehnquist denied a similar motion for a stay.
Following the entry of the transfer order of Judge Hoffman and the decision of the Seventh Circuit, District Judge Lambros of Northern Ohio entered an order vacating his own previous remand order in Skil v. Lucerne, No. C 69-461, and consolidated that case with the case being transferred from Northern Illinois, No. C 74-121, for all pretrial proceedings. A copy of the Order is appended hereto as Exhibit “B”.
Skil then moved to remand Case No. C 74-121 again to Illinois, which motion was denied. Judge Lambros certified the case for an interlocutory appeal, which was granted by a panel of this Court.
Skil contends that Judge Lambros erred in failing to remand this case to the Northern District of Illinois, since the Illinois District Court lacked the power to transfer the case to the Northern District of Ohio. Skil relies upon the case of Hoffman v. Blaski, 363 U.S. 335, 80 S.Ct. 1084, 4 L.Ed.2d 1254 (1960), a decision by a divided court, which held that a § 1404(a) transfer can only be made to a District Court in which the plaintiff could have originally brought the action while complying with the venue and service of process statutes. Skil argues that the record does not show that the Northern District of Ohio is a proper venue as to all defendants, and therefore the Illinois District Court lacked the power under § 1404(a) to transfer the case to the Northern District of Ohio.
This is precisely the very same issue that the Seventh Circuit considered and decided against Skil in the mandamus and prohibition action brought in that Court by Skil to set aside this transfer. It is thus clear that the decision of the Seventh Circuit against Skil is res judicata on the issue of the validity of Judge Hoffman’s order of transfer, and we are bound by the decision. In denying the writ, the Seventh Circuit did not base its decision on the ground that [557]*557mandamus and prohibition were not the appropriate remedies. The order entered by the Seventh Circuit does not permit any such narrow construction.
Skil argues that we must apply the rule of Blaski in spite of the Seventh Circuit’s decision, because in that case the Supreme Court affirmed a remand order of the Seventh Circuit in spite of the fact that a mandamus action to prevent the transfer had been unsuccessful in the Fifth Circuit. In Blaski, the Fifth Circuit’s action was held not res judicata as to the merits of the transfer because the Fifth Circuit never reached the merits. The party opposing the transfer had merely moved for leave to file a petition for a writ of mandamus, and the Fifth Circuit denied the motion.2 Here, Skil filed a petition, the Seventh Circuit 'considered the merits of the petition and denied relief after reviewing the petition, tnfe memorandum in support thereof, the supplemental appendix and the joint answer\of the respondents.
further contention of Skil is that the Seventh Circuit’s denial of a writ of mandamus and prohibition is not binding on this Court because the standard of review in a mandamus action differs from the standard of review in an interlocutory appeal. This distinction does not change the result in this case. Skil argued in the Seventh Circuit that Judge Hoffman lacked power to transfer the case because of Blaski. Had Skil been correct, the Seventh Circuit would have been required to issue the writ. By denying the writ, the Seventh Circuit must necessarily have decided that Judge Hoffman had power to transfer the case because the District Court in Ohio could properly exercise jurisdiction over the action. The standard for testing jurisdiction does not differ in a mandamus action from the standard used in an appeal.3 The Seventh Circuit would not have refused to issue the writ had Judge Hoffman lacked power to transfer the case. We should never assume that a court of concurrent jurisdiction neglected to perform its duty, particularly when its order clearly shows full performance. Mandamus is the proper remedy when a transfer has been ordered in violation of the legal limitations of § 1404(a). Van Dusen v. Barrack, 376 U.S. 612, 615 n. 3, 84 S.Ct. 805, 11 L.Ed.2d 945 (1964); Johnson & Johnson v. Picard, 282 F.2d 386 (6th Cir. 1960).4
[558]*558Finally, Skil contends that this Court cannot consider the Seventh Circuit’s order as res judicata because to do so would conflict with some curious dictum5 found in Blaski, 363 U.S. at 340 n. 9, 80 S.Ct. 1084. The Court listed three reasons why the Fifth Circuit’s order was not res judicata:
1. The Fifth Circuit’s order was interlocutory;
2. Not on the merits; and
3. entered in the same case as the Seventh Circuit’s decision in Blaski.
While it would be improper for us to question the applicability of those reasons to the facts in Blaski, we must conclude that those reasons are inapplicable to the facts before us. A proceeding upon a petition for a writ of mandamus is a separate action, not an appeal in Skil’s lawsuit. Therefore, the Seventh Circuit’s order was not interlocutory, but a final disposition, challengeable only by writ of certiorari in the Supreme Court, which Skil did not seek. Furthermore, the Seventh Circuit must necessarily have decided the power-of-transfer issue on the merits, as explained above. Finally, the Seventh Circuit’s order was not issued in the case before us, but was issued in a separate action, Skil Corp. v. Hoffman, No. 73-1697. Thus none of the reasons for denying the effect of res judicata in Blaski are present here.
Alternatively, the order of the Seventh Circuit in refusing to set aside by mandamus the transfer order had the effect of establishing the validity of the transfer order as the law of the case.6 As Professor Moore states:
[Sjuppose the district court orders a transfer of the action. If this order is then reviewed by an appellate court on the merits, sustained, and the transfer accordingly effected, the transferee-district court should accept the ruling as the law of the case for it, and there should be no further transfer except under the most impelling and unusual circumstances. (IV J. Moore, Federal Practice 110.404(8) at 531-32 (2d ed. 1974) [footnotes omitted])
Under the law-of-the-case analysis, we need not find that reconsideration of the Seventh Circuit’s decision is beyond our power, but we need only consider whether it “would . [be] wise to apply the law-of-the-case doctrine as a sound rule of practice.” Id. at 534.
[The] law of the case is a sufficiently flexible doctrine that it permits departure where clearly warranted. But in the main there should be adherence to the prior ruling, for it is important that the type of issue involved be not subject to perpetual litigation. (Id. at 532 n. 9)
When three federal courts, one having coordinate jurisdiction with this Court, have considered and rejected the same objection to transfer raised by Skil, we see no reason to avoid applying law-of-the-case doctrine as a sound rule of practice. While we might be willing to depart from applying law-of-the-case if one of the defendants was objecting to transfer because there exists no proper venue as to him in the transferee district, we do not have such a case before us. Skil was already before the Court in Northern Ohio as a party in another case raising the same issues of patent validity, which case has been consolidated with the transferred case. Lucerne had agreed to indemnify its customers who were the original defendants in the transferred action. Thus Lucerne is in reality the sole target of Skil’s attack on the patent in both lawsuits. We see no reason to avoid applying the law-of-the-case doctrine, thereby allowing Skil to litigate the validity [559]*559of the patent in two different courts simultaneously.7 We also note that the outcome of this case on the merits will not depend upon the transfer question nor will Skil be prejudiced by the transfer.
The aim of our system of jurisprudence is to settle the merits of a dispute with reasonable dispatch. The doctrine of the law-of-the-case has developed to achieve that end.
[I]f litigation is not terminated within a reasonable time there is a denial of justice; efficient dispatch of court business in a manner fairly approximating “justice” is sometimes better than a tardy disposition that may approximate more nearly some theoretical ideal. (Id. 1 0.404[1] at 409)
The legislative history of § 1404(a), found in the Reviser’s Notes, states that the section “was drafted in accordance with the doctrine of forum non conveniens.” It was never intended to afford a vehicle in patent litigation to shuttle cases involving the same patents between District Courts in different Circuits, resulting in a battle over the choice of forum, arid delaying indefinitely a trial on the merits. The present litigation has resulted in unreasonable delay in reaching the merits of the patent dispute. The two cases which have been consolidated by District Judge Lambros, and remain ripe for resolution, were filed originally in Illinois on (respectively) July 11, 1968 (No. 68-C-1290) and November 16, 1970 (No. 70-C-2858). Judge Lambros was correct in describing the situation as “chaotic”; and the time has certainly come to bring order to this situation by adjudicating issues which have shuffled between the Illinois and Ohio District Courts for eight years. We should put a stop to forum-shopping and bring to a close this protracted litigation over the forum.
The order of the District Court is affirmed.
EXHIBIT “A"
IN THE UNITED STATES DISTRICT COURT FOR THE NORTHERN DISTRICT OF ILLINOIS EASTERN DIVISION
CIVIL ACTION No. 72 C 2854
SKIL CORPORATION, Plaintiff, MILLERS FALLS COMPANY, v. ROCKWELL MANUFACTURING COMPANY and WEN PRODUCTS, INC., Defendants,
LUCERNE PRODUCTS, INC.,
Intervenor.
ORDER
The above matter came before the Court on July 30, 1973 on the “Motion of Skil Corporation under Rule 21, Federal Rules of Civil Procedure, to add Mr. Benjamin H. Matthews as a Party-Defendant” and upon the briefs and memoranda filed by the parties in connection therewith and it further appearing to the Court that the following facts and circumstances, constituting a matter of record before this Court, are of significance to the determination of such Motion:
[560]*560On July 11, 1968, Skil Corporation, a corporation of Delaware and the plaintiff herein (sometimes referred to hereinafter as “Skil”) filed an action against Lucerne Products, Inc., an Ohio corporation and the intervenor in the case at bar (sometimes hereinafter referred to as “Lucerne”) in the Northern District of Illinois, Eastern Division, as Civil Action No. 68 C 1290, which action related inter alia to the Gawron Patent, U.S. Patent 3,209,228.
On June 6, 1969, Judge Hubert L. Will ordered that Civil Action 68 C 1290, in its entirety, be transferred to the U.S. District Court for the Northern District of Ohio (Eastern Division), which transfer was made by the Clerk of the Court on June 11, 1969 and the cause was subsequently docketed by the Ohio Court as No. C 69-461.
Shortly after the Order of Transfer was entered, the U.S. Supreme Court handed down its Decision in Lear, Inc. v. Adkins, 395 U.S. 653, 89 S.Ct. 1902, 23 L.Ed.2d 610 (1969).
On April 23, 1970, the Ohio District Court by Judge Ben C. Green ordered that Civil Action C 69-461 be transferred to the Northern District of Illinois to afford Judge Will a basis to reconsider the propriety of the assertion by the defendant, Lucerne, of the defense of patent invalidity' as to the Gawron Patent, U.S. Patent 3,209,228.
On September 24, 1970, pursuant to a Memorandum Opinion, Judge Hubert L. Will again ordered that the entire action, Civil Action 68 C 1290 be transferred to the District Court for the Northern District of Ohio, Eastern Division.
In that Memorandum Opinion this Court, speaking through Judge Will, discussed the transfer matter at pages 5, 6,17 and 18 and specifically stated as follows as page 17:
“As noted above in part I of this Opinion dealing with the history of this complicated litigation, this Court has previously determined that this entire action properly belongs in Ohio because of the pendency there of a related suit by Lucerne and Slater Electric Inc. against Arrowhart Inc., the latter being a counterclaim defendant in the present suit.
“Our colleague in Ohio likewise recognized the propriety of retaining the present suit there as a companion case to the suit by Lucerne and Slater Electric Inc. The Court there acknowledged that it would be more convenient for the parties and witnesses to have the action tried in Ohio rather than in Illinois and further noted that his sole motivation for returning the case to Illinois was to avoid second guessing another District Court Judge; thus he allowed this Court to rule on the Motions relating to the prior Summary Judgment. The District Court Judge acknowledged his willingness to re-accept jurisdiction over the entire litigation after this Court ruled on those motions and even went so far in support of his belief that the litigation properly belonged in Ohio as to grant certain motions of the parties conditioned upon the return of the litigation to that Court.
“We see no new elements in these proceedings which lead to a conclusion that the original decision to transfer this case to enable the litigation to proceed with all the parties in one forum was incorrect. Therefore, defendant’s Motion pursuant to 28 U.S.C. 1404(a) to transfer the entire litigation back to the District Court for the Northern District of Ohio, Eastern Division, is granted.”
The entire action, Civil Action 68 C 1290 was re-transferred by the Clerk on October 6, 1970.
On November 16, 1970, Skil filed Civil Action No. 70 C 2858 naming as defendants Rockwell Manufacturing Company and Wen Products, Inc., two indemnified customers of Lucerne, in the United States District Court for the Northern District of Illinois, Eastern Division. That action was assigned to Julius J. Hoffman, United States District Judge. Lucerne moved for leave to intervene under the provisions of Rule 24 F.R.C.P. and such leave was granted on February 7, 1971. That action also related to the Gawron Patent, U.S. Patent No. 3,209,228 issued September 28, 1965.
On February 29, 1972, District Judge Thomas D. Lambros in Civil Action No. C [561]*56169-461, in the United States District Court, Northern District of Ohio, Eastern Division, enjoined Skil from proceeding in connection with Civil Action 70 C 2858. In the Order of Judge Lambros, the Court stated as follows:
“The other action which Lucerne in essence seeks to enjoin Skil from proceeding is presently pending in the Northern District of Illinois, namely, Skil Corporation v. Rockwell Manufacturing Company and Wen Products, Inc. v. Lucerne Products, Inc., Civil Action 70 C 2858. The issues raised there are essentially the same as those raised in the instant lawsuit. Further, Lucerne is in essence the real party in interest in that suit. The law is clear that in such a situation wherein the issues are essentially the same as well as the parties, the Court first acquiring jurisdiction should be allowed to proceed with it without interference from courts under suits subsequently filed. See Carbide & Carbon Chemical Corp. v. United States Industrial Chemicals, Inc., 140 F.2d 47, 49 (4th Cir., 1944); Milwaukee Gas Specialty Co. v. Mercoid Corp., 104 F.2d 589, 592 (7th Cir., 1939); In re Georgia Power Co., 89 F.2d 218, 221 (5th Cir., 1937).
“Since this Court was the first one to acquire jurisdiction over the issues, inasmuch as its jurisdiction will be seriously impeded and interfered with if the other action is permitted to proceed, since irreparable injury will result to Lucerne by forcing it to engage in multiple discovery proceedings simultaneously, inasmuch as Skil will not be injured by the granting of the injunction and since the granting of the injunction will result in the vast savings of judicial time and effort, the Court grants Lucerne’s request for injunctive relief.”
The cause in Civil Action No. 70 C 2858 came on for trial on Monday, November 13, 1972 before this Court, but counsel for the plaintiff having represented to the Court that the plaintiff was unable to proceed by reason of the restraining order issued on February 29, 1972 by the United States District Court for the Northern District of Ohio, Eastern Division, in the case of Skil Corporation v. Lucerne Products, Inc. et al., C 69-461, the Amended Complaint in Civil Action No. 70 C 2858 was dismissed without prejudice, each party to bear its own costs on November 14, 1972.
On November 13, 1972, Skil Corporation as plaintiff, filed a civil action in the United States District Court for the Northern District of Illinois, Eastern Division, against Millers Falls Company, Rockwell Manufacturing Company, Thor Power Tool Company and Wen Products, Inc., Civil Action 72 C 2854. Thor Power Tool Company was subsequently dismissed by agreement. Millers Falls Company was an indemnified customer of Lucerne and on Motion of Lucerne, Lucerne Products, Inc. was granted leave to intervene under Rule 24 F.R.C.P. on February 7, 1973.
On February 13, 1973 Judge Lambros issued a Memorandum Opinion and Order amending the February 29, 1972 Restraining Order so as to enjoin Skil, its officers, agents, employees, attorneys or any other persons acting on its behalf from proceeding in the case of Skil Corporation v. Millers Falls Co., Case No. 72 C 2854 in the Northern District of Illinois.
With respect to the original Restraining Order of February 29, 1972, Skil took an appeal to the Court of Appeals for the Sixth Circuit and the Restraining Order was upheld by the Court of Appeals for the Sixth Circuit:
Skil Corporation v. Lucerne Products, Inc. (C.A. 6-Cause No. 72-1282, affirmed April 24, 1972)
Skil petitioned for certiorari to the United States Supreme Court, however, certiorari was denied on October 10, 1972.
With respect to the Amended Restraining Order dated February 13,1973, Skil filed an appeal to the Court of Appeals for the Sixth Circuit, which appeal the District Court later dismissed on Skil’s own Motion.
On June 28,1973, Judge Lambros entered an Order dissolving the Amended Restraining Order dated February 13, 1973 against Skil from proceeding in this action, Civil [562]*562Action 72 C 2854. Judge Lambros further ordered Civil Action C 69-461 transferred to the Northern District of Illinois.
Lucerne has taken an appeal from such action by the Ohio District Court, which appeal was docketed July 19, 1973 in the Court of Appeals for the Sixth Circuit as Appeal No. 73-1738.
There should be no obstacle to the exercise of this Court’s discretion under 28 H U.S.C. § 1404 insofar as venue and jurisdiction is concerned since Lucerne is manufacturer of the accused structures and is indemnifier of the other defendants and is the real party in interest and has exercised full control of the litigation in both 70 C 2858 and 72 C 2854 with the full consent and approval of the other defendants, Millers Falls Company, Rockwell Manufacturing Company and Wen Products, Inc.
The matters placed at issue by virtue of the plaintiff’s Motion, and considering the potential role of Benjamin H. Matthews as a party-defendant, if he should be added as a party, this Court pursuant to the spirit of 28 U.S.C. § 1404, for the convenience of the parties, witnesses, and in the interest of justice, would then be clearly obligated to consider the propriety of transferring this cause to the Northern District of Ohio.
Therefore, to give effect to the initial determination and transfer orders of Judge Will, and taking notice of the past actions of the Northern District of Ohio and the Sixth Circuit Court of Appeals relative to this series of litigation involving the Gawron Patent U.S. Patent No. 3,209,228, together with this Court’s personal experience with two related suits, causes Nos. Civil Action 70 C 2858 and Civil Action 72 C 2854, both filed subsequent to the initial action, 68 C 1290, and considering the relative interests of each party in the Gawron patent litigation, and recognizing the propriety but consequence of granting the Motion pending in the action at bar:
It is Ordered and Adjudged
That the present action 72 C 2854 be transferred in its entirety to the United States District Court for the Northern District of Ohio, Eastern Division.
That the plaintiff’s pending Motion under Rule 21 of the Federal Rules of Civil Procedure for Leave to Add Benjamin H. Matthews as a party-defendant, is referred to the Northern District of Ohio, Eastern Division, for such action as that Court might in its discretion see fit to enter.
That the Clerk of the Court is hereby ordered and directed to transfer forthwith the entire file in this case 72 C 2854, including all pleadings, motions, discovery transcripts, and related documents to the Clerk of the United States District Court for the Northern District of Ohio, Eastern Division.
Dated at Chicago, Illinois, this 31st day of July, 1973.
/s/ JULIUS J. HOFFMAN Julius J. Hoffman, Senior Judge United States District Court
EXHIBIT "B"
UNITED STATES DISTRICT COURT NORTHERN DISTRICT OF OHIO EASTERN DIVISION
No. C 69-461
SKIL CORPORATION, INC.,
Plaintiff,
v.
Defendant.
(Received April 17, 1975)
LAMBROS, DISTRICT JUDGE
Upon motion of the defendant and in view of the transfer to this Court of Ski! Corporation, Inc. v. Lucerne Products, Inc., No. C 74-121, (formerly designated Case No. 72 C 2854, Northern District of Illinois), the Court’s order of June 28, 1973 transfering this case to the Northern District of Illinois is vacated. With the arrival of the Chicago litigation in this Court, and in view of the fact that the above-styled case was initiated prior to the transfered case, reten[563]*563tion of this case seems the proper course. Pursuant to Rule 42(a), this case is consolidated with Case No. C 74-121 for all pretrial proceedings.
IT IS SO ORDERED.
/s/ THOMAS D. LAMBROS Thomas D. Lambros United States District Judge
DATED: 4/15/75