MR. JUSTICE CLARKE delivered the opinion of the court.
On March 26, 1909, The Railroad Supply Company, petitioner, commenced this suit against The Elyria Iron & Steel Company in the Circuit (now District) Court for the Northern District of Ohio, claiming infringement of claim No. 8 of United States Letters Patent No. 538,809, granted May 7, 1895, of claims Nos. 1, 2 and 3 of Patent No. 691,332, granted January 14, 1902, and of claims Nos. 7 and 9 of Patent No...
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