(1) Note. The nonaerial propelling and/or steering means of this subclass is directed to devices auxiliary to or other than the aircraft rotor to effect propulsion and/or steering while on land or water.
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2, for vehicles convertible from an aircraft to a land or water vehicle in which the flight mechanism is disabled during travel on land or water.
50, for propulsion and steering of aircraft other than gyroplanes on land or water.