WOODBURY, Circuit Judge.
This is an appeal from a judgment dismissing a complaint brought for infringement of two patents covering improvements in work holders or "chucks" of the permanent magnetic type. The two individual plaintiffs are the respective owners by assignment of two United States patents; the Bower patent No. 2,053,177, issued on September 1, 1936, and the Bing and Block patent No. 2,209,558 issued on July 30, 1940. The third plaintiff, Brown and Sharpe...
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