US PATENT SUBCLASS 175 / 285
.~.~ Toggle or linkage between movable parts

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}
284  DF  .~ Cutter element shifted by longitudinally relatively movable parts {2}
285.~.~ Toggle or linkage between movable parts

DEFINITION

Classification: 175/285

(under subclass 284) Apparatus in which the laterally movable cutter element is moved by a link or element which is pivotally connected to the cutter element and one of the relatively longitudinally movable parts.