Wittler & Co. GmbH Fahrradfabrik bicycle. The company, based in Bielefeld, Germany, started in 1907 under the name Heinrich Wittler Maschinenfabrik und Fahrradbau. They produced bicycles and mopeds with JLO, Sachs or Lohmann engines (also motorized three-wheeler was available). The company still exists and manufactures machine components.