PHILLIPS, Circuit Judge.
This is a patent infringement suit brought by Greenawalt against the Stearns-Roger Manufacturing Company. Patent No. 1,374,500, hereinafter referred to as patent No. 500, was issued April 12, 1921, on an application filed October 30, 1915. Patent No. 1,374,446, hereinafter referred to as patent No. 446, was issued April 12, 1921, on an application filed October 16, 1918.
The specification of each patent states that the invention has...
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