Electric headlamp motor

In German: "Stellmotor für Leuchtweitenregelung"
In this specific little e-motor (TM Bosch) an electric driven worm gear actuates a normal gear in a desmo Group 0 like (nut and bolt) way.
A pen is actuated forward or backward and so influencing the height of the headlamp beam. Left picture shows the position turned out and right picture the position turned in. When replacing the actuator pen for a valve a desmodromic valve gear could be contemplated.

Another curious use of the group 0 desmoprinciple is in the valve of a modern type (plastic) winebag.
In the Left picture the valve (hole) is open.
In the Right picture the valve (hole) is closed.