US PATENT SUBCLASS 175 / 420.2
.~.~.~ 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}
414  DF  .~ Impact or percussion type {5}
420.1  DF  .~.~ Insert {1}
420.2.~.~.~ Includes diamond

DEFINITION

Classification: 175/420.2

Includes diamond:

(under subclass 420.1) Structure including diamond as a specific material.