US PATENT SUBCLASS 175 / 121
.~ Rotary drive for relatively advancing feed screw

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

113  DF  WITH MEANS TO SIMULTANEOUSLY FEED AND ROTATE TOOL FROM A SINGLE MECHANICAL ELEMENT {3}
121.~ Rotary drive for relatively advancing feed screw

DEFINITION

Classification: 175/121

(under subclass 113) Apparatus in which a feed screw moves axially relative to a means which is causing it to rotate.