US PATENT SUBCLASS 175 / 306
.~.~ With means to couple members to prevent relative rotation

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  DF  .~ Telescoping members relatively rotatable {1}
306.~.~ With means to couple members to prevent relative rotation

DEFINITION

Classification: 175/306

(under subclass 305) Apparatus in which selectively engageable means are provided on the telescoping members for transmitting rotary motion from one member to the other.