POPE, Circuit Judge.
The appellant, here called Ry-Lock, as assignee of the inventor and patentee, brought this suit for infringement of letters patent No. 2,380,794, which was issued for a "tensioning and locking device for frameless window screens." The defendant, Sears, Roebuck & Co., here called Sears, was charged with selling tensioning and locking devices for frameless window screens which infringed Ry-Lock's patent. The sales occurred at Sear's store at...
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