`Polygraphic papers' coder/de-coder by D'Montfort.
- Science Museum, Mathematics: The Winton Gallery
- Object Number:
Open: 205 mm x 360 mm x 12 mm, .34 kg
Closed: 205 mm x 180 mm x 24 mm, .34 kg
- cipher machines
- Christie, Manson and Woods Limited
- Permanent collection
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