US PATENT SUBCLASS 175 / 404
.~.~ 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}
403  DF  .~ Core forming type {3}
404.~.~ With core-breaking means

DEFINITION

Classification: 175/404

(under subclass 403) 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:

249+, for undisturbed core retaining or severing means.

333, for a rolling cutter bit of the core forming type having core breaking means.