MR. JUSTICE BRADLEY delivered the opinion of the court.
This suit was commenced in the Circuit Court in December, 1861, by bill in equity filed by Thomas Sayles, the appellee, on letters-patent No. 9109, for an improvement in railroad-car brakes, issued on the sixth day of July, 1852, to Henry Tanner, as assignee of Lafayette F. Thompson and Asahel G. Bachelder. The bill charged that the Chicago and Northwestern Railway Company, from the 1st of June, 1859, to the...
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