(under subclass 382) Apparatus in which the cutter element is adapted to be selectively held in different positions for the purpose of increasing the circular outline of the cutting edge as the bit is rotated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
202, for devices operable from the surface to control position of tool or cutter element.
263+, for a cutter element which is laterally shiftable during operation.
SEE OR SEARCH CLASS
172, Earth Working, 741+, for a laterally adjustable earth working tool.
