US PATENT SUBCLASS 175 / 276
.~.~.~ Frangible or discardable element

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

263  DF  CUTTER ELEMENT LATERALLY SHIFTABLE BELOW GROUND (E.G., EXPANSIBLE) {13}
274  DF  .~ With shifting mechanism spring biased to operative position {3}
275  DF  .~.~ With separate latch {2}
276.~.~.~ Frangible or discardable element

DEFINITION

Classification: 175/276

(under subclass 275) Apparatus in which the movable latch member comprises a part which is destructible or discarded so that the part is used only one time.

SEE OR SEARCH THIS CLASS, SUBCLASS:

301, for below ground hammer or impact devices with a frangible means to releasably retain the impact member against reciprocation.

307, for a cutting edge cover which is generally frangible or discardable.