OPINION
KNOX, District Judge.
In this civil action the court must determine the validity of United States Letters Patent No. 2,932,509, "Body Exercising Apparatus", issued to Harold Zinkin on April 12, 1960. This action is but a part of a larger litigation among these parties. Their lawsuits in this court involve questions of copyright infringement, unfair competition, patent infringement, patent misuse, and antitrust violations.
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