JACKSON, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming that of the Examiner in rejecting claims 16, 31, and 32 of the application for a patent.
Claim 16 is illustrative and reads as follows: "16. In a structure of the class described, a pair of cylindrical screens of different mesh positioned end to end, a third screen of finer mesh than the former positioned around the screen of finer...
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