SIBLEY, Circuit Judge.
On Christmas Eve of 1941, Phillips Petroleum Company sued Shell Oil Company for infringement of claim 2 of Patent No. 2,002,394 issued in May, 1935, to plaintiff as assignee of the inventor Frey, seeking injunction and an accounting of profits and damages. The defendant denied infringement, and claimed the patent was void for lack of invention in view of the prior art,
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