ROCHE, Chief Judge.
The complaint herein charges defendant with infringement of four United States patents on hinges, consisting of one design patent and three mechanical patents.
Defendant by its answer denied infringement and the validity of the patents in suit. In its amended answer the defendant alleged that patents 2,521,756, 2,535,324 and 2,586,573 are invalid for failure to comply with Sec. 112 of the Patent Act of 1952...
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