Here you can see the KM 3-31 model from 1957. The development of the KM 3 began with the construction of a test model to determine the most suitable rotational speed for the drive. After extensive mixing and kneading trials, the development team designed the drive unit. When it came to the form of the KM 3, the design department developed various models of the base plate, bowl, mixing arm and motor base that were combined with the technology until the first preproduction model, the wistar, emerged.