Uhrenfabrik C. Werner, Villingen in Baden, Germany
This mechanical calculator was introduced in 1907. Only a few thousand machines were made and production ceased in 1908. Adsumudi was an adding and subtracting calculator. With a slide multiplication and division was possible. Adsumudi is a rare calculators and only five are known to exist. Our Adsumudi with the slide is the only one known.