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 Primary Examiner rejecting claim 12 of appellant's application for a patent. No claims have been allowed.
The claim before us reads as follows:
"12. A building unit of cement-sand mix comprising a horizontal body portion along the bottom face of the unit, formed with two solid load-carrying, fire-resistant...
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