LENROOT, Associate Judge.
Appellant has taken this appeal from a decision of the Board of Appeals of the United States Patent Office, affirming that of the Examiner, rejecting claims 34 and 35 of appellant's application for want of invention over the prior art.
Said claims read as follows:
"34. An expansion joint consisting of a pre-formed board-like body of plastic material having one face provided with a groove for interlocking with paving material...
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