That the Bosch Universal Plus & the Nutrimill Artist mixers are both belt-driven! As you can see, with the bottom cover removed, the machineries of both mixers are shown using a belt-drive system to power the machineries. The Bosch has a V-type belt, while the Nutrilmill Artiste uses a flat gear-drive belt!
Ankarsrum is belt driven also.
I have the Electrolux Assistant DLX-2000, the older version of the Ank, which is also belt driven. So are the Kenmore mixers & also KWS mixers.
Kenwood, as well. At least the British built ones.