CAMPBELL, District Judge.
This is a suit in equity for the alleged infringement of patent No. 1,321,150, issued to Howard C. Root, assignor to the Prest-o-Lite Company, Inc., for controlling valve for vacuum-operated power means, granted November 11, 1919, on an application filed May 9, 1917.
The defendant has by answer interposed the defenses of invalidity and noninfringement.
The plaintiff has title by mesne assignments to the patent in suit, and...
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