SWAIM, Circuit Judge.
The plaintiffs-appellants are the assignees of two patents: one, No. 2,139,413, issued December 6, 1938, on a joint for pipe connections, and the other, No. 2,171,217, issued August 29, 1939, on a metal packing ring for use with, as a part of, such a joint for pipe connections as was described in the first patent. Plaintiffs brought this action for infringement of both patents. The trial court held that Patent No. 2,139,413 (hereafter referred...
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