US PATENT SUBCLASS 175 / 418
.~.~.~ Plural openings

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  DF  .~.~ With internal-fluid passage {2}
418.~.~.~ Plural openings

DEFINITION

Classification: 175/418

(under subclass 417) Apparatus in which the passage has a plurality of inlet or exhaust ports.