US PATENT SUBCLASS 175 / 417
.~.~ With internal-fluid passage

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}
417.~.~ With internal-fluid passage {2}
418  DF  .~.~.~> Plural openings
419  DF  .~.~.~> Cruciform

DEFINITION

Classification: 175/417

(under subclass 414) Apparatus in which the bit is provided with a drilling fluid passage enclosed within the body of the bit and having an inlet or exhaust port opening to the

outside of the bit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

339+, and 393, for a bit provided with a lined fluid passage or where the fluid passage includes a nozzle.

405, for a core forming impact type bit.