Hänvisningar finns i följande patent|
| US4070792 | 21 apr 1976 | 31 jan 1978 | | Game device for launching and pushing a rolling wheel | | US4254575 | 12 feb 1979 | 10 mar 1981 | | Illuminated flying saucer-like toys | | US6366869 | 1 feb 1999 | 2 apr 2002 | | Rolling circle | | US6482136 | 14 sep 1999 | 19 nov 2002 | Maui Toys, Inc. | Water-filled hoop construction | | US6494760 | 3 jul 2002 | 17 dec 2002 | Maui Toys, Inc. | Water filled hoop construction | | US6890238 | 27 jun 2003 | 10 maj 2005 | Maui Toys, Inc. | Liquid containing hoop with improved connector |
|
