MR. JUSTICE BLATCHFORD delivered the opinion of the court.
On the 27th of May, 1879, the Consolidated Safety-Valve Company, a Connecticut corporation, brought a suit in equity, in the Circuit Court of the United States for the District of Massachusetts, against the Crosby Steam Gauge and Valve Company a Massachusetts corporation, for the infringement of letters patent No. 58,294, granted to George W. Richardson, September 25, 1866, for an improvement in steam safety...
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