Nestler 0320 Oilrule sys Schmeling slide rule with container 1969 Germany

This slide rule comes with the original signed container, both made in Germany by Nestler, dated 1969. This model is the dedicated 0320 Oilrule with special scales for oil related calculations. There are scales according to the system by Dr. Schmeling covering viscosity and thickness of oil as well as temperatures and mixture. The Nestler name and model name and number is on the rule and also on the container. It is made of plastic with an all plastic cursor and is reformed with metal ends. Cursor, slide rule and container are complete and in vergood condition with only small signs of use and age. It measures ca. 33,5 cm or 13 1/4 inches. Check the attached video on how to work your vintage man tool: slide rule operation instructions!