IWA 11048 DAT traffic accident reconstruction slide chart 1970 Germany

Interesting slide chart by IWA model 11048 for the German DAT (automotive trust) in German, called the Datenschieber für Unfallrekonstruktion (traffic accident reconstruction). Can be used for calculation relating to car accidents, like braking distance, reaction speed and car velocity. It seems to be a simpler version of the IWA 15302 Sacher Traffic circular slide rule. It is in very good condition so there are only small signs of use or age from normal use, fully functioning with all parts intact. Comes with instructions in German and leather signed sleeve as well. It measures ca. 20 cm or ca. 8 inches wide. Check the attached video on how to work your vintage man tool : slide rule operation instructions!