Mr. Justice CURTIS delivered the opinion of the court.
This is an action on the case for the violation of a patent-right granted to the defendant in error on the 26th day of May, 1842, for "a new and useful improvement in regulating the draft of stoves." On the trial in the Circuit Court for the Northern District of New York, the defendants took exceptions to the rulings of the District Judge, who presided at the trial, and have brought the case here by a writ of...
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