CELEBREZZE, Circuit Judge.
This is an appeal from an order of the United States District Court for the Western District of Michigan, Southern Division, holding a patent on an electrical wiring duct owned by the Panduit Corporation, U. S. Patent No. 3,024,301, issued on March 6, 1962 to K. R. Walch [hereinafter the "Walch" patent], valid and infringed by two devices manufactured by Stahlin Bros. Fibre Works, Inc. 35 U.S.C. §§ 101, 102, 103 (1964). Stahlin...
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