File:CipherTypewriter3.jpg

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Part of the Mechanism of the O'Brien Cipher Typewriter

Summary edit

Description
English: See Apparatus for coding and decoding, US Patent 2046276, Applied for March 30th 1929
Date
Source Cipher Apparatus, US Patent 2270137, Applied for 11 May 1939
Author Unknown authorUnknown author

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May or may not be in the public domain
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current12:00, 10 February 2021Thumbnail for version as of 12:00, 10 February 2021589 × 806 (74 KB)Oldnoccer (talk | contribs)Uploaded a work by Unknown from Cipher Apparatus, US Patent 2270137, Applied for 11 May 1939 with UploadWizard

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