US PATENT SUBCLASS 175 / 434
.~.~ Diamond

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

327  DF  BIT OR BIT ELEMENT {21}
425  DF  .~ Specific or diverse material {3}
434.~.~ Diamond

DEFINITION

Classification: 175/434

Diamond:

(under subclass 425) Apparatus in which the very hard, crystallized form of the element carbon, commonly called a "diamond" is included as a specific material in the structure of the bit.