US PATENT SUBCLASS 175 / 395
.~.~ Impact type

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

327  DF  BIT OR BIT ELEMENT {21}
394  DF  .~ With helical-conveying portion {1}
395.~.~ Impact type

DEFINITION

Classification: 175/395

(under subclass 394) Apparatus in which the cutting edge of the bit is of the type which is adapted to disintegrate the formation by percussive action.

SEE OR SEARCH THIS CLASS, SUBCLASS:

414+, for impact type bits, per se.