CAMPBELL, District Judge.
This is an action for the alleged infringement of patent No. 1,274,410, issued to Albert Abbe Griswold, the patentee, and John Francis Chevalier, assignee of one-half, for flexible shingle, dated August 6, 1918. The defenses are invalidity and noninfringement.
The problem that confronted the patentee was to improve the construction of a flexible shingle, so that the free end might be held down. This had been attempted, but without...
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