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| This is a vintage calculator book from 1926. It is essentially a huge multiplication table with a sliding rod calculator embedded in the back cover. Bergmann was the owner of the company "Continental Büro Reform G.m.b.h." located in Berlin, Germany. It sold many calculating books for different craftsman and administrations, and also a sliding rod calculator called the "Correntator". The calculator book has been donated by Colette Heirendt in 2014. | |
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