Aristo 80135 Valmet pocket slide rule full set 1966 Finland Germany

This pocket slide rule is made by Aristo from Germany. It has the number 80135 and has been made especially for the Valmet Papermachine Company from Finland in 1966. This full set contains the slide rule in a 2 pocket leather sleeve (also signed Valmet) that holds two plastic cards. One with instructions and one with additional information for more calculations.  The case and slide rule are complete and in very good condition with only small signs of use and age. The case measures ca. 17,5 cm or 7 inches. Check the attached video on how to work your vintage man tool : slide rule operation instructions!