US PATENT SUBCLASS 173 / 34
.~ Structure extends between opposed points

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

31  DF  WITH WORK ENGAGING MEANS SUPPORTING DRIVE {4}
34.~ Structure extends between opposed points {1}
35  DF  .~.~> Tool advanced laterally of structure

DEFINITION

Classification: 173/34

(under subclass 31) Apparatus in which the material being worked is engaged by the structure at opposed points, such as opposed positions on the walls of a shaft or tunnel.