OPINION
MURRAY M. SCHWARTZ, District Judge.
This is an action for patent infringement of United States Patent No. 3,510,391 brought by plaintiff Grefco, Inc. ("Grefco") against defendant Kewanee Industries, Inc. ("Kewanee"). Kewanee has counterclaimed for a declaratory judgment of patent invalidity, unenforceability and non-infringement.
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