|
| US4051908 | 5 Nov 1976 | 4 Oct 1977 | | Downhole drilling system |
| US4905777 | 29 Abr 1988 | 6 Mar 1990 | Rudolf Hausherr & Sohne GmbH & Co. KG | Device for producing drilling holes from an angled position with respect to the drilling axis |
| US5361833 | 18 Nov 1993 | 8 Nov 1994 | Triumph*LOR, Inc. | Bottom set, non-retrievable whipstock assembly |
| US5535822 | 8 Sep 1994 | 16 Jul 1996 | Enterra Corporation | Apparatus for retrieving whipstock |
| US6220372 | 4 Dic 1997 | 24 Abr 2001 | Wenzel Downhole Tools, Ltd. | Apparatus for drilling lateral drainholes from a wellbore |
