US PATENT SUBCLASS 411 / 911
.~ One-way drive

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

910  DF  ANTITAMPER MEANS {1}
911.~ One-way drive

DEFINITION

Classification: 411/911

One-way drive:

Art collection of fasteners or fastener elements wherein the anti-tamper means includes tool engaging surfaces permitting rotation of the fastener in the direction of insertion but does not include surfaces facilitating rotation in the direction of removal.