US PATENT SUBCLASS 175 / 335
.~.~.~ Leading fixed cutter

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

327  DF  BIT OR BIT ELEMENT {21}
331  DF  .~ Rolling cutter bit or rolling cutter bit element {26}
334  DF  .~.~ Bit with leading cutter forming smaller diameter initial bore {1}
335.~.~.~ Leading fixed cutter

DEFINITION

Classification: 175/335

(under subclass 334) Apparatus in which the leading cutter or pilot comprises a cutter element or cutting edge other than a rolling cutter element or portion thereof.