SOBELOFF, Circuit Judge.
In suit here is a patent relating to an improvement in traveling fans or cleaners installed principally in textile factories to blow lint from spinning and weaving machines and from yarns and fabrics during the manufacturing process. The plaintiff, Parks-Cramer Company, is the owner of patent No. 2,524,797, issued to it on October 10, 1950, as assignee of the inventor, Grover B. Holtzclaw, its research director.
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