|
| US4266347 | 7 Sep 1979 | 12 May 1981 | | Holder for a plumb bob |
| US4920657 | 23 Oct 1987 | 1 May 1990 | | Assembly for plumb bob and line |
| US5323539 | 9 Jun 1993 | 28 Jun 1994 | | Plumb bob reel |
| US5586394 | 2 Jun 1995 | 24 Dic 1996 | | Self-contained plumb bob and ink line marker with line capable of automatic braking and retraction |
| US5704131 | 6 May 1996 | 6 Ene 1998 | | Adjustable plumb bob and line capable of automatic braking and retraction |
| US6898861 | 14 Oct 2003 | 31 May 2005 | | String line tool and sheaths therefor |
| USD334348 | 19 Mar 1990 | 30 Mar 1993 | | Plumb bob |
