SWEENEY, Chief Judge.
The plaintiff in this action charges infringement of Patent No. 2,818,832, issued to George H. Bushway on January 7, 1958, and assigned by him to the plaintiff. The defendant denies infringement and asserts that all the claims of the patent are invalid for lack of invention and because of public use or sale more than one year prior to their presentation to the Patent Office in their present and final form.
The patent in suit covers a...
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