FREED, District Judge.
The plaintiffs herein charge infringement of letters patent and seek a final injunction against the defendant, an accounting, and the assessment of three-fold damages and costs.
The plaintiffs are James Heddon's Sons, a Michigan corporation, George E. Barnhart, Frank L. A. Graham and Henry L. Knoop. Heddon's Sons is the exclusive licensee of the plaintiff, Barnhart, to whom letters patent were issued on Aug. 11, 1936, for an invention...
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