US PATENT SUBCLASS 175 / 405.1
.~.~ Includes diamond

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}
405.1.~.~ Includes diamond

DEFINITION

Classification: 175/405.1

Includes diamond:

(under subclass 403) Apparatus in which the cutter element or cutting edge of the bit contains the very hard crystalline form of the element carbon.