PER CURIAM.
In this action, brought by appellants for patent infringement, a summary judgment was entered in favor of appellees upon the ground of lack of invention. The court concluded that the only substantial addition which the patents involved had made to prior art "would have been obvious to a layman, let alone to a person skilled in the * * art."
Involved are Patent No. 2,763,258, issued to appellant Hughes Blades as assignee on September 11, 1956, and...
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