MARIS, Circuit Judge.
This is an appeal by the defendant from a decree of the district court holding claims 2, 3 and 4 of the plaintiff's Poppe Reissue Patent No. 19,921 valid and infringed. The claims in suit relate to a method or process of making paper bags. Claim 3, conceded to be typical, is as follows:
"3. The method of making envelope bags, which comprises making cuts in a web of paper at substantially bag length intervals along the length thereof,...
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