R. DORSEY WATKINS, District Judge.
Plaintiff, a Maryland corporation, has sued for declaratory judgment that underground insulated pipe systems installed with its insulating concrete (such a concrete being hereinafter referred to as Wicor) do not infringe defendant Zonolite Company's United States Patent No. 2,355,966 to Goff. Defendant Zonolite Company, a Montana corporation, assignee of the Goff patent, and Insulating Concrete Corporation, a Virginia corporation...
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