US PATENT SUBCLASS 411 / 521
.~.~.~ Circular

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}
520  DF  .~.~ Sheet metal {5}
521.~.~.~ Circular

DEFINITION

Classification: 411/521

Circular:

(under subclass 520) Subject matter wherein the material is substantially in the form of a circle.