MR. JUSTICE ROBERTS delivered the opinion of the Court.
In these cases writs of certiorari were granted to resolve conflicts with respect to the scope and alleged infringement of claims 1 to 6, 8, 10, 14 and 15 of the Gullborg Patent No. 1,307,734. In No. 23 the Circuit Court of Appeals, while holding the claims valid, so construction them as to exculpate the accused devices from the charge of contributory infringement.
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