Mr. Justice BALDWIN delivered the opinion of the court.
This case comes here on a writ of error to the Circuit Court for the western district of Pennsylvania, in an action brought by the plaintiffs, assignees of James Harley, against the defendants, for the infringement of a patent granted to Harley for an improvement in the mode of casting chilled rollers and other metallic cylinders and cones, in which judgment was rendered for the defendants. On the trial it appeared...
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