Supreme Court of United States.
MR. CHIEF JUSTICE STONE delivered the opinion of the Court.
Respondent began the present litigation as three separate suits against the respective petitioners for infringement of the Nelson Patent No. 2,109,678 of March 1, 1938, for a "contact switch for ball rolling games." The defenses were non-invention in view of the prior art, anticipation by prior publication, use and sale, non-infringement
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