Improvements In Devices for Cyphering and Decyphering Messages and the Like; Frenchman, Georges Lugagne, Applies for British Patent of His Invention

Document A70385

263.03 KiB

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Patent No. 1,311,457 Cipher Apparatus by Luigi Nicoletti of Rome Italy

Document A70407

339.82 KiB

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Patent No. 1,667,780 Apparatus for Coding & Decoding Messages by Joseph Grassi of London, England

Document A70411

490.81 KiB

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Patent No. 1,826,034 Device for Teaching Arithmetic by R M Williamson

Document A70431

272.06 KiB

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Patent No. 1,956,384 Pocket Cryptographic Apparatus by Albert Gentet, Paris, France

Document A70410

143.42 KiB

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Patent No. 2,395,863 Cryptographic Device by W F Friedman

Document A70433

457.63 KiB

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Patent Publications: Counting/Calculating Device; Educational Device

Document A70383

495.34 KiB

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Patents 1,471,437 (Oct 23, 1923) and 832,871(oct 9, 1906)

Document A70438

432.6 KiB

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Two British Patent Documents for Crypto Devices

Document A71811

661.31 KiB

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