MR. JUSTICE GRAY, after stating the case as above reported, delivered the opinion of the court.
The decision of this case turns upon § 4899 of the Revised Statutes, by which it is enacted that "every person who purchases of the inventor or discoverer, or with his knowledge and consent constructs any newly invented or discovered machine or other patentable article, prior to the application by the inventor or discoverer for a patent, or who sells or uses one so...
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