US PATENT SUBCLASS 175 / 325.4
.~.~.~ Having removable inserts

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

320  DF  WITH TOOL SHAFT DETAIL {4}
325.1  DF  .~ Shaft carried guide or protector {3}
325.2  DF  .~.~ Coupled between shaft sections or bit and shaft section {2}
325.4.~.~.~ Having removable inserts

DEFINITION

Classification: 175/325.4

Having removable inserts:

(under subclass 325.2) Apparatus where a bore wall contacting portion is readily placed in or removed from a slot or an aperture in the guide or protector means.