MR. JUSTICE STONE delivered the opinion of the Court.
Decision in these cases turns on the question whether, in the light of the patent office history of the Jardine patent on a piston for gas engines, the court below, in construing the specifications and claims, erroneously included one element, "flexible" or "yielding" webs, in the patented combination.
A related question was considered by this Court in connection with the Gulick...
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