US PATENT SUBCLASS 405 / 181
.~.~.~ With depth adjustment

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

154  DF  PIPE OR CABLE LAYING, RETRIEVING, OR UNDERWATER MANIPULATION {6}
174  DF  .~ By means advancing along terrain and guiding pipe or cable into subterranean position {6}
180  DF  .~.~ Including trench forming plow with pipe or cable guide {3}
181.~.~.~ With depth adjustment

DEFINITION

Classification: 405/181

With depth adjustment:

(under subclass 180) Method or apparatus wherein the plowlike tool can be adjusted relative to its supporting structure whereby the vertical dimension of the trench can be selectively varied.