A ball with a jigsaw cover includes a hollow core having a first hemisphere and a second hemisphere fixedly connected to each other to form a complete spheroid. Multiple puzzle pieces are detachably adhered to an outer periphery of the hollow core and each has a curvature equal to that of the hollow...http://www.google.es/patents/US20040222588?utm_source=gb-gplus-sharePatente US20040222588 - BALL WITH A JIGSAW COVER
Número de solicitud: 10/429,846 Número de publicación: US 2004/0222588 A1 Fecha de presentación: 6 May 2003 Patente emitida: US6805350 ( Fecha de emisión 19 Oct 2004)
