HATFIELD, Judge.
This is an appeal from a decision of the Board of Appeals, affirming the decision of the Examiner, rejecting claims 1, 2, 13, 14, and 15 in appellant's application for an alleged invention relating to a tool retaining coupling for percussive machines.
Claim 15 is illustrative. It reads:
"15. A tool retaining coupling for percussive machines comprising a cylindrical member adapted to be secured to the percussive machine and to receive...
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