STONE, Circuit Judge.
This is an action for alleged infringement of claims 1, 2, 3, 4, 7, 8, and 9 of patent No. 1,414,387, to Benjamin Wexler. The defenses are invalidity of the patent and noninfringement. From a decree adjudging the claims involved invalid, plaintiff takes this appeal.
This patent is for a dumb-waiter door structure. The structure embodies a rigid metal frame at the door opening having guides or tracks wherein vertically travel two counterbalanced...
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