Mr. Justice NELSON.
This is an appeal from the Circuit Court of the United States for the District of Columbia.
The bill was filed by the plaintiffs against the defendant, Bacon, to compel him to surrender and cancel letters patent for a new and useful machine for folding paper, granted 10th of August, 1858. Both parties set up a claim to the invention as assignees of John North, the inventor. The assignments to the plaintiffs were made under the dates of...
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