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Pressure balanced loading piston for triaxial test cells |
Christopher F. Johnson |
1987-07-14 |
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Lawrence B. Owen, DANIEL MASTERSON |
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Lawrence B. Owen |
1987-01-06 |
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Process for solution mining |
Arfon H. Jones |
1986-12-23 |
| 4462617 |
High pressure rotary coupling |
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1984-07-31 |
| 4241796 |
Active drill stabilizer assembly |
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1980-12-30 |
| 4182215 |
Failsafe hydraulic prestressing nut |
Randy Nielsen |
1980-01-08 |