MR. JUSTICE JACKSON delivered the opinion of the court.
This suit was brought by appellants' testator, Philo D. Beckwith, against the appellee for the alleged infringement of three letters patent, viz.: No. 123,142, issued January 30, 1872; No. 135,621, issued February 11, 1873; and No. 206,074, issued July 16, 1878, all for improvements in heating stoves. The defences set up and interposed were that the patents were all void for want of novelty and patentable invention...
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