US PATENT SUBCLASS 175 / 302
.~.~ Condition for release adjustable

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.~.~ Condition for release adjustable {1}
303  DF  .~.~.~> Adjustable below ground

DEFINITION

Classification: 175/302

(under subclass 300) Apparatus in which the holding means is adjustable to vary the manner in which the holding means may be released or the force required to effect release of the holding means.