This is a suit based on the alleged infringement by defendant, Horni Signal Manufacturing Corporation, of patent No. 1,992,214 for an invention in traffic detectors, issued by the United States Patent Office to plaintiff, David Katz, on February 26, 1935, on an application filed November 12, 1928. The invention uses the principle of electro-magnetic induction (Faraday)— that when a magnetic...
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