WILLIAM C. COLEMAN, District Judge.
The present suit is one for alleged infringement of patent No. 1,930,980, issued October 17, 1933, to H. C. Maibohm, application filed October 30, 1929, for a variable electrical resistor and switch. The plaintiffs are the present owners of the patent.
By stipulation the issue has been reduced to the question of the validity of the patent. Briefly stated, the patent is for the combination of a standard form of variable resistance...
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