US PATENT SUBCLASS 175 / 325.5
.~.~ Surrounding existing shaft section

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.~.~ Surrounding existing shaft section {2}
325.6  DF  .~.~.~> Held by a fastener parallel to shaft axis
325.7  DF  .~.~.~> Held by discrete fastening means tangential to shaft axis

DEFINITION

Classification: 175/325.5

Surrounding existing shaft section:

(under subclass 325.1) Apparatus where the guide or protector

encircles and is secured to the shaft.