MR. JUSTICE BROWN, after stating the case, delivered the opinion of the court.
The only Federal question presented by the record in this case turns upon the admissibility of evidence tending to show that the patents issued to the plaintiffs Pratt and Ryan were infringements upon a prior patent issued to Springer. Plaintiffs contend that the state court, by admitting such testimony, thereby assumed jurisdiction of a patent case, in violation of Rev. Stat. § 711...
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