|
| US4128228 | 9. Juni 1977 | 5. Dez. 1978 | | Extension ladder hoist |
| US4215850 | 7. Nov. 1978 | 5. Aug. 1980 | Dutton-Lainson Company | Winch |
| US4269285 | 9. Nov. 1978 | 26. Mai 1981 | Tokyo Shibaura Denki Kabushiki Kaisha | Lifting apparatus for electrical switchboards |
| US4930599 | 17. Aug. 1989 | 5. Juni 1990 | | Ladder and carriage combination |
| US6095284 | 6. Okt. 1999 | 1. Aug. 2000 | | Elevatable stands for physically challenged hunters |
| US6234453 | 12. Aug. 1999 | 22. Mai 2001 | | Rolling door winch apparatus |
| US6244381 | 18. Febr. 2000 | 12. Juni 2001 | | Ladder hoist device |
| US7004288 | 25. Juli 2002 | 28. Febr. 2006 | Ryo Keiso Ltd. | Lift apparatus |
| US7424932 | 2. Sept. 2004 | 16. Sept. 2008 | | Lifting hoist assembly |
| US7546902 | 6. Nov. 2006 | 16. Juni 2009 | | Personnel lift apparatus |
| US7686566 | 23. Apr. 2008 | 30. März 2010 | | Method of using a lifting hoist |
| US7900745 | 27. März 2007 | 8. März 2011 | | Motor driven lifting assembly |