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'Plus' calculating machine, c 1955.

Richardson, Claire

'Plus' calculating machine, c 1955.
3 1 c m
actual image size: 32cm x 23cm


A mechanical hand calculator made by Bell Punch Company Limited, a later variant of the popular German Brunsviga lever-operated calculator. Key driven adding and calculating machines were widely used in accounting and business until the late 1970s when they were replaced by electronic calculators.

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© Science Museum / Science & Society Picture Library

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