SAWTELLE, Circuit Judge.
This suit was brought by the appellant for the alleged infringement by the appellees of the appellant's United States letters patent No. 1,757,601, issued May 6, 1930, and covering a welding rod used for applying welding on facing for well drilling tools and the like, which are subject to extreme abrasion.
The welding rod in its preferred form consists of a mild steel tube of suitable length, closed at both ends, and filled with pieces...
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