DUFFY, Circuit Judge.
This is a suit for infringement of plaintiff's United States Patent No. 2,833,396, issued on May 6, 1958, on application filed April 12, 1957. The District Court held Claims 1, 2, 4, 5 and 6, the only claims involved in this suit, were invalid and not infringed.
Since 1946, plaintiff corporation and its partnership predecessor have been engaged in the manufacture of farm equipment including mixer mills, auger elevators and feed grinders...
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