LENROOT, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming a decision of the examiner rejecting, upon various grounds hereinafter discussed, claims 1, 2, 4, 5, 7, 8, and 10 to 13, inclusive, of appellant's application for a patent.
Claims 1, 2 and 10 are typical of the rejected claims and read as follows:
1. A plastic mass containing hydrating cement, and fly ash.
2. A concrete...
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