US PATENT SUBCLASS 470 / 91
.~.~ And plural punches

Current as of: June, 1999
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470 /   HD   THREADED, HEADED FASTENER, OR WASHER MAKING: PROCESS AND APPARATUS

87  DF  APPARATUS FOR MAKING INTERNALLY THREADED FASTENER, I.E., NUT {7}
89  DF  .~ Having forger {5}
91.~.~ And plural punches

DEFINITION

Classification: 470/91

And plural punches:

(under subclass 89) Subject matter further provided with two mechanisms wherein each mechanism is capable of imparting or forming a cavity in the nut.