Nice. Basically the same as a slide rule. There is a german company that still sells these. [0] [0]: https://www.rechenschieber-werbemittel.de/ https://www.re

Nice. Basically the same as a slide rule. There is a german company that still sells these. [0] [0]: https://www.rechenschieber-werbemittel.de/ https://www.rechenschieber-werbemittel.de/