|
| US3936924 | 25 janv. 1974 | 10 févr. 1976 | | Releaseable steel cable anchor and method for withdrawing the same |
| US4116012 | 14 juil. 1977 | 26 sept. 1978 | Nippon Concrete Industries Co., Ltd. | Method of obtaining sufficient supporting force for a concrete pile sunk into a hole |
| US4140429 | 3 févr. 1978 | 20 févr. 1979 | Dyckerhoff & Widmann Aktiengesellschaft | Corrosion protected tensioning member for a prestressable anchor in solid rock |
| US4183699 | 18 mai 1978 | 15 janv. 1980 | | Washer/gasket for mine roof bolt assembly |
| US4498817 | 2 mars 1983 | 12 févr. 1985 | | Roof bolts for mines and the like workings |
| US4693638 | 22 avr. 1986 | 15 sept. 1987 | | Roof bolt assembly having a sealing plug for preventing a deterioration of the mine roof |
| US7318689 | 12 mai 2004 | 15 janv. 2008 | Atlas Copco Rock Drills AB | Method and device for rock bolting |
