US PATENT SUBCLASS 175 / 305
.~ Telescoping members relatively rotatable

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

293  DF  BELOW-GROUND (1) HAMMER, OR (2) IMPACT MEMBERS {7}
305.~ Telescoping members relatively rotatable {1}
306  DF  .~.~> With means to couple members to prevent relative rotation

DEFINITION

Classification: 175/305

(under subclass 293) Apparatus in which the telescoping members are so arranged that they may freely rotate relative to each other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

298, for relatively rotatable telescoping members in which continuous unidirectional rotary motion of one member causes repetitive impacts.