The first DCT to succeed in production was the Easidrive automatic transmission introduced about the 1961 Hillman Minx mid-sizing auto. This was accompanied by a variety of eastern European tractors through the 1970s (using guide operation via just one clutch pedal), then the Porsche 962 C racing auto in 1985. https://gearboxauto53962.blognody.com/35991858/the-greatest-guide-to-gearbox-auto