Poster: Laboratory's Early 20th Century Calculator, 12x9in.
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Description
Size: 12x9in Early 20th Century CalculatorWe have more National Physical Laboratory Posters. Choose from our catalog of over 500,000 posters! Early 20th century calculator. This hand calculator, the Brunsviga 20, is mechanically operated by a handcrank (right). Addition and subtraction sums were performed in a single operation, but multiplication and division were accomplished by repeated mecha
