OPINION
LACEY, District Judge:
This is an action for infringement by the assignee of United States Patent No. 3,306,805 (hereinafter called plaintiff's patent or the Klein patent), issued on February 28, 1967, for an Apparatus for Making Printed Corrugated Paper Board, on an application filed in the United States Patent Office on May 20, 1963.
Plaintiff is a Delaware corporation, having its principal place of business in Cincinnati, Ohio.
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