MR. JUSTICE McKENNA delivered the opinion of the court.
This is a petition for a writ of mandamus to compel the Court of Appeals of the District of Columbia to take jurisdiction of an appeal from the Commissioner of Patents.
The petition shows that petitioner was the first inventor of a new and useful improvement in the art of making salt by evaporation of brine, which improvement consisted of new and useful means for removing incrustation of calcium sulphate...
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