The story of SoRoTo starts in 1983 when Benny Andersen, a bricklayer at the time, made the decision to construct a mixer for himself and his colleagues for the purpose of mixing materials for tiling, flooring, concrete renovation and regular brick and stone work which was portable enough to use inside.
Due to the indoor use of the forced action mixer, it was a requirement for it to fit through doors and for it to be simple to take up a staircase, as well as being suitably powered by a standard domestic output. Many forced action mixers of the day were cumbersome, difficult to handle and powered by either 3-phase current (rarely seen in domestic properties) or noisy, smoky diesel or petrol engines.