US PATENT SUBCLASS 175 / 310
.~ With helical conveyer

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

308  DF  WITH RECEPTACLE {4}
310.~ With helical conveyer

DEFINITION

Classification: 175/310

(under subclass 308) Apparatus in which the receptacle is provided with a conveyor or feed screw.

SEE OR SEARCH THIS CLASS, SUBCLASS:

323, and the search there noted for other devices with a helix or helical structure.