This is a rather unique slide rule was produced according to the system by B.Filzek for calculations for tank tracks for the German military. It is a seldom seen construction for Aristo where 2 sliders are used and a generic cursor. It was made in such a small run that Aristo printed stickers, like some other small batch slide rules like this for pipes, system Nagel and this wire slide rule. It also has a specific table on the back with a tank track scheme and short manual. Fortunately it also comes with it’s full instructions manual in German as well as a leather case (not signed). Guesstimating production ca, 1965. The slide rule and cursor are made of plastic and everything is in good condition with small signs of normal use. This pocket slide rule measures ca 17 cm or 7 inches long. Check the attached video on how to work your vintage man tool: slide rule operation instructions!
