Exactus stylus-operated adding and subtracting device, 1955-1965.
Image number: 10328770
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
