Aristo 80100 BG woven concrete pocket slide rule case 1960 Germany

This special pocket slide rule comes in the original BG marked leather sleeve and is made by Aristo from Germany. This model is the first pocket version with number 80100 for calculations for iron woven concrete mats (Lagermatten). It is a special slide rule made for the Company Baustahlgewebe from Düsseldorf Germany. It only has special scales on the body as well as on both sides of the slider for 2400 kg/cm² and 2800 kg/cm². The back of the slide rules shows many values in tables. The special curser and rule are complete there are only small signs of use on the slide rule and cursor. It measures 17 cm or 6 3/4 inches. Do check the attached video on how to work your vintage man tool : slide rule operation instructions! Also read the blog post on collecting concrete slide rules for more in-depth information on these interesting pieces.