US PATENT SUBCLASS 175 / 333
.~.~.~ With core-breaking means

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}
332  DF  .~.~ Core forming-type bit {1}
333.~.~.~ With core-breaking means

DEFINITION

Classification: 175/333

(under subclass 332) Apparatus in which the bit is further provided with means to disintegrate the undisturbed cylindrical portion of the formation after it has been formed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

404, and the search there noted for other core forming type bits having core breaking means.