DENMAN, Circuit Judge.
This is an appeal from a summary judgment dismissing a suit for declaratory judgment determining the validity of Patent No. 1,748,007 for a guiding, floating and cementing device for well casings, now owned by appellee Baker Oil Tools, Inc. Appellees answered appellant's complaint and then took appellant's deposition under Rule 26 (a) of the Federal Rules of Civil Procedure, 28 U.S.C.A. following section 723c.
After taking the deposition...
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