SANBORN, Circuit Judge.
This is an appeal from a judgment for the plaintiffs, Texas corporations, (appellees) in an action brought by them in June, 1959, against Bros Incorporated, a Minnesota corporation, (appellant) (Bros) to secure a declaratory judgment that its United States Patent No. 2,610,557 for a "Pneumatic Roller Compactor," issued to C. W. Bros, et al., September 16, 1952, on an application filed November 17, 1949, was invalid. In their complaint the plaintiffs...
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