US PATENT SUBCLASS 175 / 23
.~.~ Drive point retracted through shaft or casing

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

19  DF  BORING WITHOUT EARTH REMOVAL (I.E., COMPACTING EARTH FORMATION) {3}
22  DF  .~ Drive point detached from shaft to form cased bore or with installation of casing {1}
23.~.~ Drive point retracted through shaft or casing

DEFINITION

Classification: 175/23

(under subclass 22) Subject matter including a step or means for withdrawing a drive point through a hollow shaft or casing.

(1) Note. See subclass 257 and search there noted for earth boring means removable through a tool shaft.