CLARK, Circuit Judge.
This appeal involves the validity of Patent No. 2,118,468 for a "Method of Casting Articles of Intricate Design and A Product Thereof," issued to the plaintiff on May 24, 1938. Though the answers of both the original and the intervening defendants to the plaintiff's claim of infringement denied infringement as well as the validity of the patent, the district court found infringement by all the defendants as to at least some of their operations...
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