US PATENT SUBCLASS 175 / 266
.~ Plural selectively shiftable cutter elements

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}
266.~ Plural selectively shiftable cutter elements

DEFINITION

Classification: 175/266

(under subclass 263) Apparatus in which a plurality of laterally movable cutter elements are provided and means are also provided which permits one of said cutter elements to move laterally while another laterally movable cutter element is temporarily held against such movement.