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Class Information
Number: 175/26
Name: Boring or penetrating the earth > Automatic control > Of boring means including a below-ground drive prime mover
Description: Subject matter in which a below ground drive prime mover comprises part of the boring means.

Patents under this class:

1 2 3

Patent Number	Title Of Patent	Date Issued
4632191	Steering system for percussion boring tools	Dec. 30, 1986
4592432	Automatically operated boring head	Jun. 3, 1986
4491186	Automatic drilling process and apparatus	Jan. 1, 1985
4280569	Fluid flow restrictor valve for a drill hole coring tool	Jul. 28, 1981
4275795	Fluid pressure actuated by-pass and relief valve	Jun. 30, 1981
4212359	Downhole weight control device for impact rock drilling tool	Jul. 15, 1980
4027210	Method and control system to limit shifting movement of a winning tool for a tunneling machine	May. 31, 1977
4007797	Device for drilling a hole in the side wall of a bore hole	Feb. 15, 1977