"Desmodromic", first invented in the 1800's, used in engines in the Indy 500 in the very early 1900's. Modern application, Ducati motorcycle engine. This is yet another example of the desmodromic valve actuation. The valve action can be direct or indirect via a camshaft which both opens AND closes the valve. Mercedes Benz, 1955 300SLR, desmodromic valve actuator! There is nothing new under the sun...
