CAMPBELL, District Judge.
This is a suit for the alleged infringement of three patents relating to the temperature control of exothermic (heat imparting) pads used to generate chemically sufficient heat to impart a permanent wave to hair as follows:
Patent No. 1,892,426, issued to Ralph L. Evans, assignor to Zotos Corporation, for method of and means for permanently waving hair, granted December 27th, 1932, on an original application filed January 21, 1932...
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