US PATENT SUBCLASS 175 / 353
.~.~.~ Cone or frustum rolling 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}
350  DF  .~.~ Laterally offset cutter axis {2}
353.~.~.~ Cone or frustum rolling cutter

DEFINITION

Classification: 175/353

(under subclass 350) Apparatus in which the rolling cutter element comprises an axially elongated roller which tapers in diameter along its axis.