US PATENT SUBCLASS 175 / 401
.~ Cutting edges facing in opposite axial directions

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

327  DF  BIT OR BIT ELEMENT {21}
401.~ Cutting edges facing in opposite axial directions

DEFINITION

Classification: 175/401

(under subclass 327) Apparatus in which the bit is provided with longitudinally spaced cutting edges, the cutting edges at one spacing facing in one axial direction and the cutting edges at a different spacing facing in the opposite axial direction of the bit.