|
| US4266621 | 14 Aug 1978 | 12 May 1981 | Christensen, Inc. | Well casing window mill |
| US5078545 | 2 Aug 1990 | 7 Jan 1992 | Kabushiki Kaisha Iseki Kaihatsu Koki | Method for boring hole in the ground and apparatus therefor |
| US5402856 | 21 Dec 1993 | 4 Apr 1995 | Amoco Corporation | Anti-whirl underreamer |
| US5423824 | 23 Mar 1993 | 13 Jun 1995 | Radi Medical Systems AB | Method of accessing hard tissue |
| US5810826 | 14 Feb 1995 | 22 Sep 1998 | Radi Medical Systems AB | Puncture instrument |
| US7299887 | 26 Mar 2003 | 27 Nov 2007 | Kingdream Public Ltd. Co. | Roller bit with a journal pin offset from the central axis thereof |