US PATENT SUBCLASS 175 / 248
.~.~ Core forming cutting edge or element on receiver

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

244  DF  WITH MEANS MOVABLE RELATIVE TO TOOL TO RECEIVE, RETAIN, OR SEVER UNDISTURBED CORE {3}
246  DF  .~ Receiver removable through below-ground tool shaft {2}
248.~.~ Core forming cutting edge or element on receiver

DEFINITION

Classification: 175/248

(under subclass 246) Apparatus in which the core receiver is provided with a cutting edge or element which is adapted to participate in the forming of a core of undisturbed material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

257+, and the search there noted for tool removable or insertable through or around driving or driven shaft.