COLEMAN, Chief Judge.
This is a patent infringement suit brought by the plaintiff, the Minnesota Mining & Manufacturing Company, a Delaware corporation, as assignee of United States Patent No. 2,574,971, for a highway marking paint containing glass beads, issued November 13, 1951, to Harry Heltzer (hereinafter referred to as the Heltzer patent). This suit is against six individual defendants, members of a Baltimore partnership doing business as the Baltimore Paint...
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