SPARKS, Circuit Judge.
Plaintiff charged defendant with infringement of three United States patents to plaintiff numbered respectively 1,771,185; 1,947,216 and 1,947,217. We shall refer to them respectively in this discussion as patents 1, 2 and 3. Patent 1 was issued July 22, 1930, on an application filed January 21, 1928. Patents 2 and 3 were issued February 13, 1934, on applications filed respectively on February 9, 1931, and October 29, 1931.
The defendant...
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