US PATENT SUBCLASS 175 / 309
.~ Removable or insertable through below-ground tool shaft

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

308  DF  WITH RECEPTACLE {4}
309.~ Removable or insertable through below-ground tool shaft

DEFINITION

Classification: 175/309

(under subclass 308) Apparatus in which the receptacle means may be inserted in and withdrawn from a hollow tool shaft at any time during operation of the boring means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

246+, for a core receiver removable through a below ground tool shaft.

257+, and the search there noted for a tool or sample receiver insertable through a driving or driven tool shaft or casing.