Mr. Justice CURTIS delivered the opinion of the court.
This is an appeal from a decree of the circuit court of the United States for the southern district of New York, in a suit in equity brought by the appellee, Parkhurst, against the appellants. The bill states, and the proofs show, that Parkhurst, being the owner of letters-patent for improvements in the machine for ginning cotton and wool, on the 22d of May, 1845,
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