MR. JUSTICE WHITE delivered the opinion of the court.
The sole question in this case is whether the appliance to which the plaintiff in error claims the rights of a patentee under the grant of letters patent No. 134,978, bearing date January 21, 1873, issued to his assignor, involves invention, or is simply a manifestation of mechanical skill.
There is no doubt that in this, as in all similar cases, the letters patent are prima facie evidence that the...
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