This is a great slide rule with duplex slider and see-through sides, made by Aristo from Germany. This set contains the slide rule, the original Aristo container with yellow inlay sheet, the manual (German) and the outer box.. This model is 915 Elektro with rubber feet on the back side. Everything is complete and in great condition with only minimal signs of use and age (small part missing from outer box). Box measures ca. 31 cm or 12 1/4 inches. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
