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 claim 47 in appellants' application for a patent for an alleged invention relating to a detachable blade for surgical knives.
The appealed claim reads:
"47. A detachable rib-back surgical blade made by first rolling a thin flexible strip of steel to produce therein symmetrical...
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