ServerGeared motorSelected sample downloads. In germany, there are four series of servers produced by boserl, namely, r-series tilt gear-reducing motors, f-series parallel-axis tilt gear-reducing motors, k-series propeller-patron gear-reducing motors, and s-series tilt gear snail-reducing motors. The following is a sample of the k-series propeller gear-reducing machine, for which three other series of selected types are required, with a micro-credit on the website. thank you for reading this article