US PATENT SUBCLASS 175 / 420.1
.~.~ Insert

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.~.~ Insert {1}
420.2  DF  .~.~.~> Includes diamond

DEFINITION

Classification: 175/420.1

Insert:

(under subclass 414) Apparatus in which the cutting edge of the bit is formed of a relatively small element of abrasive resistant material which is inserted in a slot or aperture in the bit and secured therein.