DENISON, Circuit Judge.
The Zip Company is the owner of the Werder patent, No. 1,353,197, applied for August 8, 1918, and issued September 21, 1920, for a grinding compound which finds its chief utility in grinding valves of automobile engines; also the Werder improvement patent No. 1,534,196, issued April 21, 1925. The Pep Company owns the Holmes patent, No. 1,380,383, applied for September 27, 1920, issued June 7, 1921, for a similar compound. Holmes had been in...
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