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Class 172/346 - Plural tools independently or oppositely manipulable


Subclass of Class 172 - Earth working
Definition: Apparatus including a plurality of earth working elements
No. of patents: 1
Last issue date: 08/08/2006


NumberTitleIssue Date
7086808Method and apparatus for on-grade boring
A method for installation of an underground pipe includes an initial step of boring a pilot hole through the ground at a predetermined grade angle by extending a drill string having a steerable boring bit mounted thereon through the ground. Upon reaching an end loca...
08/08/2006
 
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