BINGHAM, Circuit Judge.
This is a suit in equity for infringement of letters patent No. 1,834,580, applied for July 23, 1929, issued December 1, 1931, to Philip Drinker and others; letters patent No. 1,906,453, applied for November 23, 1931, and issued May 7, 1933, to Philip Drinker and others; and letters patent No. 1,906,844, applied for November 27, 1931, and issued May 2, 1933, to Philip Drinker and others. These patents are now owned by Warren E. Collins, Warren...
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