HASTIE, Circuit Judge.
The matter in question here is the validity of a patent on a drive-in theatre. United States Letters Patent No. 1,909,537 was issued on May 16, 1933 to R. M. Hollingshead, Jr. It was subsequently assigned to plaintiff, Park-In Theatres, a New Jersey corporation which brought this suit against two individual and two corporate defendants, all citizens of California, charging infringement of certain claims of the patent and praying for damages...
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