HICKS, Circuit Judge.
Suit by the Commercial Shearing & Stamping Company, appellant, against the Youngstown Steel Car Corporation, appellee, for infringement of claim 1 of letters patent No. 1,757,813, May 6, 1930, to Robert V. Proctor and Harry M. Schaab for a "tunnel liner"; and of claim 3 of letters patent No. 1,778,606, October 14, 1930, to Robert V. Proctor for a "metallic structure." Both patents were assigned to appellant.
The defenses were: Noninfringement...
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