Exactus stylus-operated adding and subtracting device, 1955-1965.

Image number: 10328770

Exactus stylus-operated adding and subtracting device, 1955-1965.

Exactus with swivelling half plate for add and subtract options, marked 'mini-add, made in England'.

Image number:
10328770
Credit:
Science Museum/Science & Society Picture Library
Date taken:
29 October 2003 12:16
Image rights:
Science Museum
 

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