DOBIE, Circuit Judge.
American Signal Corporation (hereinafter called the plaintiff) brought a civil action against International Roll-Call Systems, Incorporated, and Charles F. Thompson (hereinafter called the defendants) based upon the alleged infringement by defendants of claim No. 1 of each of two patents: 1,773,891 (hereinafter called the voting switch patent) and 1,877,150 (hereinafter called the vote recorder patent). These two patents, collectively, are hereinafter...
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