US PATENT SUBCLASS 411 / 518
.~.~.~ Having gripper holes

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

511  DF  FASTENER SECURING ELEMENT {3}
516  DF  .~ Resilient metallic {3}
517  DF  .~.~ Retainer ring {2}
518.~.~.~ Having gripper holes

DEFINITION

Classification: 411/518

Having gripper holes:

(under subclass 517) Subject matter wherein the element structure is provided with at least two holes to locate and coact with a tool used to assemble or disassemble the element structure.