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| 245 | 0 | 0 | _aDual-torque conept enhances PDC-BIT efficiency in directional and horizontal-drilling programs |
| 270 | _a12/09/06 ; 03/10/02 | ||
| 300 | _a2 p. | ||
| 773 | 0 |
_tJournal of Petroleum Technology _g(dic. 1999) ; p. 28-30 |
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_aMensa-Graham, Wilmot _916449 |
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