| 10996100 |
Method and apparatus for calibrating rail scales |
Dennis C. Meyers, Trace Mayer |
2021-05-04 |
| 9681650 |
Long-distance delivery system for fishing devices |
Robert R. Mayer |
2017-06-20 |
| 4974686 |
Apparatus for handling a drilling equipment |
Robert W. Hisey |
1990-12-04 |
| 4828048 |
Hydraulic Percussion tool |
William N. Patterson |
1989-05-09 |
| 4761120 |
Well pumping unit and control system |
Robert T. Sparkman, Jr. |
1988-08-02 |
| 4552180 |
Pilot operated control valve for hydraulically actuated reciprocating pump |
— |
1985-11-12 |
| 4484637 |
Positioning control system for rock drill support apparatus |
— |
1984-11-27 |
| 4477232 |
Hydraulically actuated reciprocating piston pump |
— |
1984-10-16 |
| 4449592 |
Automatic drill string section changer |
— |
1984-05-22 |
| 4312658 |
Method of and apparatus for controlling batch thickness and glass level in a glass furnace |
— |
1982-01-26 |
| 4290491 |
Rock drill positioning mechanism |
— |
1981-09-22 |
| 4267892 |
Positioning control system for rock drill support apparatus |
— |
1981-05-19 |
| 4246973 |
Controls for hydraulic percussion drill |
— |
1981-01-27 |