|
| US4343568 | 11 Ago 1980 | 10 Ago 1982 | | Road grading and tamping appliance |
| US4431336 | 8 Feb 1982 | 14 Feb 1984 | | Concrete prefinishing tool |
| US4653957 | 21 Jun 1985 | 31 Mar 1987 | | Air driven vibration cement float |
| US5837298 | 15 Oct 1997 | 17 Nov 1998 | Face International Corp. | Piezoelectrically-actuated vibrating surface-finishing tool |
