US PATENT SUBCLASS 175 / 304
.~.~ Resiliently biased latch

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}
304.~.~ Resiliently biased latch

DEFINITION

Classification: 175/304

(under subclass 300) Apparatus in which said holding means is held in operative position by means of an elastic element.