US PATENT SUBCLASS 175 / 325.7
.~.~.~ Held by discrete fastening means tangential to shaft axis

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

320  DF  WITH TOOL SHAFT DETAIL {4}
325.1  DF  .~ Shaft carried guide or protector {3}
325.5  DF  .~.~ Surrounding existing shaft section {2}
325.7.~.~.~ Held by discrete fastening means tangential to shaft axis

DEFINITION

Classification: 175/325.7

Held by discrete fastening means tangential to shaft axis:

(under subclass 325.5) Apparatus where the guide or protector means encircles and is fixed to the shaft by a securing means having a longitudinal axis that touches a single point of a planar circle whose center is the longitudinal axis of the tool shaft.