|
| US3935678 | 18 Nov 1974 | 3 Feb 1976 | | Vacuum attachment for abrading machine |
| US3987589 | 3 Mar 1975 | 26 Oct 1976 | | Vacuum attachment for abrading machine |
| US4000538 | 10 Mar 1975 | 4 Ene 1977 | | Cleaning device |
| US4178654 | 26 Oct 1977 | 18 Dic 1979 | Alfred Mitchell | Floor polishing machines |
| US4510643 | 2 May 1983 | 16 Abr 1985 | | Vacuum floor polisher |
| US4642842 | 22 Oct 1985 | 17 Feb 1987 | Chemical Specialities Manufacturing Corporation | Rotary scrubber with inwardly retractable foam extractor ring mount |
| US5507061 | 30 Sep 1994 | 16 Abr 1996 | Nobuyoshi Kumaki | Rotary brush floor polisher |
| US5974626 | 26 Mar 1997 | 2 Nov 1999 | Nilfisk-Advance, Inc. | Collection system for a floor polishing machine |