Advertisement Slide rules 7x 1970 Germany Holland

Here are 7 different slide rule type calculators for various different technical purposes. From the 1960’s – 1970’s. Used to measure all kind of things like cogs, refrigerating, shocks, etc. Made in Germany and the Netherlands. They  come with advertisements for companies like Kohler, Atlas Copco, Bitzer Kuhlmachinenbau, BLOM B.V., MTS, Pollrich, and I.M.A.C. Some made of cardboard, some of plastic and some a combination. All in good working order with some signs of use and age. They all measure between ca. 16 – 28 cm or 6 1/2 – 10 inches long.  Check the attached video on how to work your vintage man tool : slide rule operation instructions!