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

 
Exactus stylus-operated adding and subtracting device, 1955-1965.
4 0 c m
 
38cm
actual image size: 30cm x 32cm

Description

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

Image Details

Image Ref.
 
10328770

© Science Museum / Science & Society Picture Library

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