MR. JUSTICE MATTHEWS delivered the opinion of the court.
This is a bill in equity filed December 13, 1875, by the appellants, as assignees of John M. Thatcher, to restrain the alleged infringement of letters-patent No. 104,376, dated June 14, 1870, granted to John M. Thatcher for certain new and üseful improvements in fireplace heaters. There was a decree below dismissing the bill, from which the complainants prosecute the present appeal.
The patentee...
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