Suit for infringement of the Fitch patent, No. 1,011,598, for a fireplace damper, issued September 12, 1911. Claims 1 and 4 are involved. They are alike in the elements called for, the difference being that claim 4 is specifically limited in its operating means. Claim 1 calls for "a fireplace damper, having a body adapted to be set in the masonry of a fireplace and provided with a pocket extension at...
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