US PATENT SUBCLASS 172 / 93
.~.~.~ Rectilinearly reciprocating blade

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
91  DF  .~ Blade movable with respect to cyclically driven carrier {2}
92  DF  .~.~ With means for moving blade {3}
93.~.~.~ Rectilinearly reciprocating blade

DEFINITION

Classification: 172/93

(under subclass 92) Apparatus in which the tooth or like earth working part or portion is driven in such a fashion that it reciprocates in a straight line path with respect to

the driven carrier upon which it is mounted.