KOELSCH, Circuit Judge.
This appeal involves United States Letters Patent No. 2,807,330, issued to plaintiff, American Air Filter Company, assignee of Richard D. Rivers, the inventor.
In this opinion the parties will be referred to by their designations in the District Court. Plaintiff brought this action for infringement against the Farr Company, seeking damages and an injunction. Defendant urged as defenses anticipation and lack of invention, as well as...
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