SIMONS, Circuit Judge.
In a suit by the appellant for infringement of claims 7-15, inclusive, of Cumfer patent, No. 1,604,339, issued October 26, 1926, for "roofing element and roof made thereof," the master, though holding the patent invalid because of abandonment and prior public sale, felt precluded by the presumption attaching to the grant from denying it validity for lack of invention over prior art, though frankly expressing doubt of its presence. The District...
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