| 5449046 |
Earth boring tool with continuous rotation impulsed steering |
— |
1995-09-12 |
| 5111891 |
Boring head for a subsurface soil-boring apparatus |
— |
1992-05-12 |
| 5096003 |
Method and apparatus for subsoil drilling |
— |
1992-03-17 |
| 5054565 |
Steering mechanism for a subsoil boring apparatus |
— |
1991-10-08 |
| 4957173 |
Method and apparatus for subsoil drilling |
— |
1990-09-18 |
| 4955439 |
Self-propelled subsoil penetrating tool system |
— |
1990-09-11 |
| 4923134 |
Self-propelled subsoil penetrating tool system |
— |
1990-05-08 |
| 4905773 |
Self-propelled subsoil penetrating tool system |
— |
1990-03-06 |
| 4886939 |
Cable sealing device and method |
— |
1989-12-12 |
| 4866214 |
Service cable for a subsoil penetrating tool and method of preventing rotation of the cable when in use |
— |
1989-09-12 |
| 4858703 |
Self-propelled subsoil penetrating tool system |
— |
1989-08-22 |
| 4842207 |
Device for detecting and measuring the tension on a cable |
— |
1989-06-27 |
| 4762151 |
Blank plug assembly |
— |
1988-08-09 |
| 4697959 |
Method and apparatus for installing an in-ground support footing around an upstanding elongate object |
— |
1987-10-06 |
| 4697649 |
Portable apparatus for and method of pole reinforcement |
— |
1987-10-06 |
| 4661018 |
Apparatus for and method of installing underground cable having above ground terminals |
— |
1987-04-28 |
| 4630972 |
Impulse injector apparatus |
— |
1986-12-23 |
| 4621950 |
Techniques for establishing inground support footings and for strengthening and stabilizing the soil at inground locations |
— |
1986-11-11 |
| 4622436 |
Plug assembly and method for encapsulating a cable within a conduit |
— |
1986-11-11 |
| 4618287 |
Techniques for establishing inground support footings and for strengthening and stabilizing the soil at inground locations |
— |
1986-10-21 |
| 4430022 |
Underground cable installing apparatus and method utilizing a multi-positionable plow blade |
— |
1984-02-07 |