US PATENT SUBCLASS 470 / 29
.~.~.~ Hollow type

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

1  DF  PROCESS {5}
27  DF  .~ Making headed fastener, e.g., rivet or nail, etc. {2}
28  DF  .~.~ Rivet type {3}
29.~.~.~ Hollow type {1}
30  DF  .~.~.~.~> Having prong

DEFINITION

Classification: 470/29

Hollow type:

(under subclass 28) Subject matter wherein the fastener is provided with a longitudinally extending bore or cavity.