MR. JUSTICE SANFORD delivered the opinion of the Court.
This is a suit in equity brought by the Thomson Spot Welder Company in a Federal District Court in Michigan for the infringement of United States patent No. 1,046,066 for improvements in electric welding, issued December 3, 1912, to the plaintiff's predecessor in title, as assignee, upon an application filed by Johann Harmatta, December 3, 1903. The chief defenses were anticipation, lack of invention, prior public...
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