US PATENT SUBCLASS 411 / 546
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Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

531  DF  WASHER STRUCTURE {11}
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547  DF  .~.~> Of folded sheet material

DEFINITION

Classification: 411/546

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(under subclass 531) Subject matter wherein the element is in the form of a cylinder and is used to maintain parts of an assembly in spaced relationship.