What happened to these buses ? I understand that Henschel bought a licence from Doble in 1931 and that they were used by Kasseler Transport AG, Bielefelder Stadtwerke and Bremer Vorortbahnen AG, as well as the Deutsch Reichsbahn, with a maximum speed of 110 km/h. But the puzzle bus seems to have been used in Scandinavia. But it's difficult to find infos about them.