US PATENT SUBCLASS 175 / 303
.~.~.~ Adjustable below ground

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}
300  DF  .~ With releasable means to detachably retain telescoping members against axial reciprocation {3}
302  DF  .~.~ Condition for release adjustable {1}
303.~.~.~ Adjustable below ground

DEFINITION

Classification: 175/303

(under subclass 302) Apparatus in which the adjustment may be effected while the device is in position to perform its intended function within the bore.