|
US5070462A
|
|
Device for locating a boring machine
|
|
US4856600A
|
|
Technique for providing an underground tunnel utilizing a powered boring device
|
|
US4896733A
|
|
Technique for providing an underground tunnel utilizing a powered boring device
|
|
EP0294088A2
|
|
Assembly for and method of coupling adjacent sections of a string of pipes
|
|
US4867255A
|
|
Technique for steering a downhole hammer
|
|
US4864293A
|
|
Inground boring technique including real time transducer
|
|
US4787463A
|
|
Method and apparatus for installment of underground utilities
|
|
US4911579A
|
|
Swivel arrangement for connecting a boring or reaming tool to a cable
|
|
US4754526A
|
|
System including a multi-stepped nozzle assembly for back-boring an inground passageway
|
|
US4881083A
|
|
Homing technique for an in-ground boring device
|
|
US4714118A
|
|
Technique for steering and monitoring the orientation of a powered underground boring device
|
|
US4755805A
|
|
Current sensing alarm arrangement for monitoring the presence of high voltage
|
|
US4821815A
|
|
Technique for providing an underground tunnel utilizing a powered boring device
|
|
US4674579A
|
|
Method and apparatus for installment of underground utilities
|
