US PATENT SUBCLASS 173 / 36
.~ Structure engages work at point diametrically opposed to tool

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

31  DF  WITH WORK ENGAGING MEANS SUPPORTING DRIVE {4}
36.~ Structure engages work at point diametrically opposed to tool

DEFINITION

Classification: 173/36

(under subclass 31) Apparatus in which the structure engages the material being worked at a point opposite to the working point, generally being the opposed wall of a shaft or tunnel.