US PATENT SUBCLASS 175 / 301
.~.~ Frangible

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}
301.~.~ Frangible

DEFINITION

Classification: 175/301

(under subclass 300) Apparatus in which said holding means comprises an element which is destructible so that said element is used only one time.

SEE OR SEARCH THIS CLASS, SUBCLASS:

276, for a frangible latching means for a spring biased shifting mechanism of an expandable cutter element.