This Aristo raw materials slide rule comes in an almost full set so with the original plastic container, with riser feet, guarantee and sheet (unfortunately no manual), which are all made in Germany ca. 1970’s. This model is the 90110 Krupp Rohstoffe, a special slide rule made for calculating raw materials volumes, weights etc, specially constructed for this German company. One side is dedicated, the other has generic scales, also found on other Aristo slide rules of that periode like the 0986 model. It is also similar in length and width. The rule measures ca. 34 cm or ca. 13 3/4 inches wide. It is in very good condition with only some silver paint loss to a corner of the cursor sides. Do check the video below on how to work your vintage man tool : slide rule operation instructions!
