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Class Information
Number: 175/282
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > With shifting mechanism spring biased to operative position > Cutter element substantially longitudinally movable on shaft > Plural elements expanded into single socket
Description: Apparatus comprising a plurality of laterally movable cutter elements which move outwardly from the longitudinal axis of the bit head or shaft to operative position and a single socket or recess on the bit head or shaft which receives in abutting relation a portion of each cutter element when they have been moved to operative position.

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