Some cone CVT models use two rollers.[23][24] In 1903, William Evans and Paul Knauf applied for any patent over a consistently variable transmission using two parallel conical rollers pointing in opposite directions and connected by belts which could be slid along the cones to vary the transmission ratio. Nonetheless in https://juliusstrol.blogtov.com/13184197/helping-the-others-realize-the-advantages-of-gearbox-cvt