US PATENT SUBCLASS 173 / 37
.~ Relatively adjustable work engaging elements

Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

31  DF  WITH WORK ENGAGING MEANS SUPPORTING DRIVE {4}
37.~ Relatively adjustable work engaging elements

DEFINITION

Classification: 173/37

(under subclass 31) Apparatus in which the work engaging structure includes plural work engaging elements, and an element is adapted to be adjusted relative to the tool drive means and relative to another work engaging element.