MR. JUSTICE BRADLEY delivered the opinion of the court.
The appeal in this case is brought to review the decree of the Circuit Court dismissing the bill of complaint, which charges an infringement of two certain patents belonging to the Keystone Bridge Company. These patents were for improvements in iron truss bridges. The first was granted to J.H. Linville and his assignee J.I. Piper, Jan. 14, 1862; the second, to the
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