ROBB, Associate Justice.
Appeal from a decision of the Patent Office in an interference proceeding, in which priority was awarded Cather, the senior party. The issue is expressed in a single count as follows:
"An envelope made from a single blank and having two opposite walls of substantially uniform size, said blank having two openings, one providing a slit and the other providing a window in one wall of the envelope, and a flap extending from the outside...
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