HAND, Circuit Judge.
This is an appeal from a judgment of the District Court for the Western District of New York (Burke, J., presiding), sustaining the validity of Patent No. 2,398,382, granted to the plaintiff, Lyon, on April 16, 1946, upon an application filed November 17, 1942. Of the nine claims all but 6 and 7 are in suit; the judgment held all seven valid, and the defendant concedes infringement. Judge Burke, in a long and careful opinion,
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