|
| US4126297 | 17 Nov 1977 | 21 Nov 1978 | | Manhole cover lifting key |
| US4488706 | 13 Jun 1984 | 18 Dic 1984 | | Manhole cover lifting hook |
| US4650232 | 19 Ago 1985 | 17 Mar 1987 | | Manhole cover lifter |
| US4681300 | 29 Mar 1985 | 21 Jul 1987 | | Apparatus for removing manhole covers and the like |
| US5153966 | 11 Jul 1991 | 13 Oct 1992 | | Lifting handle attachment for wheelbarrows |
