Friction-disk transmissions were used in a number of motor vehicles and smaller locomotives built-in the early 20th century, such as the Lambert and Metz cars. Employed now in snow blowers, these transmissions consist of an output disk that's moved throughout the area on the input disk upon which it rolls. https://fernandotusol.goabroadblog.com/31879810/rumored-buzz-on-gearbox-cvt