MATTHES, Circuit Judge.
This is an action for infringement of Patent No. 2,627,798 (hereinafter sometimes referred to as "Patent No. 798") issued to William T. Graham (plaintiff-appellee) on February 10, 1953, for a "Clamp for Vibrating Shank Plows." Graham Plow, Inc. (plaintiff-appellee) is a licensee under the patent. The trial court found the patent valid and that Claims 1 and 2 of the patent were infringed by defendants John Deere Company of Kansas City and Deere...
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