US PATENT SUBCLASS 172 / 708
.~.~.~ With separate or rigid earth working portion

Current as of: June, 1999
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172 /   HD   EARTH WORKING

681  DF  TOOL, STANDARD OR CONNECTION {32}
705  DF  .~ Spring biased or formed tool or tool part {5}
707  DF  .~.~ Spring formed tool or standard {1}
708.~.~.~ With separate or rigid earth working portion

DEFINITION

Classification: 172/708

(under subclass 707) Apparatus in which (1) a rigid earth working element is separately attached to a spring standard or (2) a spring standard is modified so as to provide a rigid earth working portion thereon.