LENROOT, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming the decision of the Examiner, rejecting claims 1 to 10, inclusive, and 12, 13, 14, 20, and 21 of appellant's application,
Claims 1, 3, 8, and 20 are illustrative of the claims in issue, and read as follows:
"1. In a device of the class described...
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