Mathematics
`Polygraphic papers' coder/de-coder by D'Montfort. Late 18th century
1940-1950
Siemens and Halske T52e Cipher Machine, known as "Geheimschreiber" Serial No.43996
1926-1930
Kryha ciphering machine, standard model, introduced 1926
Ciphering calculator in brass inscribed RSWX
1890-1910
Cipher machine composed of two discs geared together with permuted alphabet on each periphery
1909-1910
Ideal Codigraph enciphering machine, invented by Charles Durand, Ste Adresse, near Le Havre, France and made by Baveux Freres, St Nicolas d'Aliermont Seine Inferieure, France, c.1910.
1890-1920
Sir Percy Scott's cypher machine, made by A.Lege and Co. London
Prototype model of coding and decoding machine, patented by Sidney Hole
