OPINION
MASTERSON, District Judge.
Plaintiffs' complaint in this action charges the defendant with infringement of four of plaintiffs' patents, United States Letters Patent Nos. 2,507,347, 2,800,856, 2,814,990 and 3,062,139. Defendant has filed an answer and a counterclaim seeking a declaration that these patents are invalid and not infringed by the defendant. In its counterclaim defendant also seeks a declaration that a fifth patent held by the plaintiff...
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