US PATENT SUBCLASS 175 / 405
.~.~ Impact or percussion type

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

327  DF  BIT OR BIT ELEMENT {21}
403  DF  .~ Core forming type {3}
405.~.~ Impact or percussion type

DEFINITION

Classification: 175/405

(under subclass 403) Apparatus in which the cutting edge of the bit is of the type which is adapted to disintegrate the formation by a forceful contact or a repetitive striking action.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4, for core tubes driven into a formation by an explosion.

414+, for impact type bits, per se.