An actuator used shape memory alloy and a display conversion device of signs characterized in that, in the actuator equipped with a shape memory alloy allowing a movable body to work in one direction by the restoration force to the memorized shape at the time of temperature rising, a control base standing...http://www.google.com/patents/US4914908?utm_source=gb-gplus-sharePatent US4914908 - Actuator used shape memory alloy and display conversion device of signs
