MR. JUSTICE HOLMES delivered the opinion of the court.
These are bills in equity brought by the petitioners to restrain the infringement of Letters Patent No. 589342, issued to the assignee of Edward J. Dolan, and dated August 31, 1897. The patent was held invalid by the Circuit Court of Appeals for the Sixth Circuit. American Lava Co. v. Steward, 155 Fed. Rep. 731 and 740; S.C., 84 C.C.A. 157 and 166. It had been sustained by the Circuit Court...
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