Referenced by|
| US4396204 | 31 Aug 1981 | 2 Aug 1983 | | Roller skates | | US4846488 | 24 Jul 1987 | 11 Jul 1989 | | Spring drive and spring drive scooter | | US4861054 | 28 Jul 1987 | 29 Aug 1989 | | Pedal-powered skateboard | | US5224719 | 15 May 1992 | 6 Jul 1993 | | Skateboard | | US5310202 | 15 May 1992 | 10 May 1994 | | Skateboard | | US5492345 | 25 Aug 1994 | 20 Feb 1996 | | Self propelled roller skate | | US6189907 | 5 Mar 1999 | 20 Feb 2001 | | Treadle cart | | US7300065 | 27 Nov 2006 | 27 Nov 2007 | | Body weight-activated scooter |
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