US PATENT SUBCLASS 175 / 311
.~ Suspended below bit

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

308  DF  WITH RECEPTACLE {4}
311.~ Suspended below bit

DEFINITION

Classification: 175/311

(under subclass 308) Apparatus in which the receptacle is suspended in a preformed hole below the cutting portion of the tool.