HATFIELD, Associate Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the decision of the Primary Examiner rejecting the appealed claims, Nos. 21 and 22, in appellants' application for a patent for an alleged invention relating to a "unit of structural material of uneven surface, and particularly," according to the specification, "to a rigid shingle with an irregularly corrugated surface."
The invention...
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