MR. JUSTICE ROBERTS delivered the opinion of the Court.
These cases involve the validity, and the alleged infringement, of letters patent No. 1,127,660, of date February 9, 1915, isued to John H. McMichael, and assigned to Concrete Mixing and Conveying Company.
The Court of Appeals of the Second Circuit, in Concrete Mixing and Conveying Company v. Ulen Contracting Corporation,
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