BIGGS, Circuit Judge.
The appeals at bar are limited to a consideration of claims 2, 3 and 5 of United States Patent No. 1,475,980, issued on December 4, 1923 to Oscar Zerk for a lubricating apparatus. The appeals at bar are further limited by the charge made by Stewart-Warner Corporation, the appellant in each cause, that the appellees have been guilty of contributory infringement of Zerk's patent by manufacturing and selling nipples or fittings of the kind described...
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