| 000 | 00631nab a2200181 4500 | ||
|---|---|---|---|
| 005 | 20260520004038.0 | ||
| 008 | 260224s2009 xxu | ||
| 245 | 0 | 0 | _aNew drillbit offerings keep pushing the envelope |
| 260 |
_a _b _coct. 2009 |
||
| 270 | _a26/08/2010 ; 28/07/2010 | ||
| 300 | _a4 p. ; 45-48 | ||
| 520 | _aTranscripción del resumen del autor. Improvements in hardness and durability have yet to approach a limit. Even roller-cone bits are being improved with new metallurgy. | ||
| 581 | _a10 | ||
| 773 | 0 |
_tWorld Oil _g230 |
|
| 942 | _cARTICULO | ||
| 100 | 1 |
_aFischer, Perry _937095 |
|
| 999 |
_c175412 _d175412 |
||