The device of the present invention comprises an elongated body intended to be interconnected to a the bottom surface of a skateboard, and extending transverse to the longitudinal axis of the board. In use, front and rear units of the device would be mounted in place of the skateboard's front and rear...http://www.google.com/patents/US20020163144?utm_source=gb-gplus-sharePatent US20020163144 - Skateboard training device
