Reduction gears and gear motors, other than for land vehicles; irreversible linear electromechanical actuators for swing gates; irreversible electromechanical actuators with articulated arm for swing gates; linear hydraulic actuators for swing gates; underground hydraulic actuators for swing gates; irreversible electromechanical actuators for counterweight overhead doors; hydraulic actuators for counterweight overhead doors; electromechanical drive actuators for counterweight overhead and sec...