CAMPBELL, Chief Judge.
Plaintiffs bring this action against defendant for infringement of Claims 1 to 4, inclusive, and 9 to 14, inclusive, of United States Letters Patent No. Re. 23,937, issued to Earl J. Bullard on February 8, 1955, on a lapping machine. Defendant denies infringement of the aforesaid patent, asserts that it is invalid and by way of counterclaim, seeks a declaratory judgment with respect to the validity and infringement of the aforesaid patent.<...
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