MR. JUSTICE GRAY, after stating the case as above reported, delivered the opinion of the court.
The fourth plea is based upon section 7 of the act of March 3, 1839, c. 88, (in force when the patents were granted,) providing that "every person or corporation, who has or shall have purchased or constructed any newly invented machine, manufacture or composition of matter, prior to the application by the inventor and discoverer for a patent, shall be held to possess the...
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