MULLIGAN, Circuit Judge:
On February 18, 1970, Supreme Equipment and Systems Corporation commenced a declaratory judgment action against Lear Siegler, Inc. and Nat Levenberg, seeking a declaration of invalidity and of non-infringement of United States Letters Patent, Reissue No. 26,902, for a "Tilt-Proof Cabinet Construction." Levenberg, the named inventor and patent owner, and Lear Siegler, the exclusive licensee, counterclaimed for infringement. Following a two...
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