MR. JUSTICE STONE delivered the opinion of the Court.
In an earlier suit petitioners sought to enjoin an infringement of the Callahan patent, No. 948,719, and the Circuit Court of Appeals for the Sixth Circuit held the patent valid. Concrete Appliance Co. v. Meinken, 262 Fed. 958. Later the present suit was brought in the District Court for the Eastern District of Pennsylvania to enjoin an infringement of the same patent by the respondents. The District...
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