US PATENT SUBCLASS 175 / 326
.~.~ Engaging means advances in adjacent hole


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}
326.~.~ Engaging means advances in adjacent hole


DEFINITION

Classification: 175/326

Apparatus under subclasses 325.1+ in which at least a portion of the guide means advances with the tool, and is described as larger than the area of bore being formed so that the advance is guided by a surface (generally a performed bore) that is laterally spaced from the bore currently being formed by the tool.