US PATENT SUBCLASS 175 / 228
.~ With fluid pressure-actuated feed means

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

227  DF  WITH STORAGE MEANS FOR BIT LUBRICANT CARRIED BY BIT OR SHAFT {2}
228.~ With fluid pressure-actuated feed means

DEFINITION

Classification: 175/228

(under subclass 227) Apparatus in which the friction reducing fluid is supplied or fed to the cutter or a portion thereof by a fluid pressure or fluid flow operated means usually the fluid pressure or flow of the drilling fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

99, and the search there noted for other pressure fluid operated devices.