Where can I find a copy of the M.Dv. 111? I heard that Bismarck used these disks to code recognition light signals (Erkennungssignale E.S.).
Also, any additional information of how these disks were used.
http://jproc.ca/crypto/german_code_disks.html
Marine Dienstvorschrift Nr. 111
- Ulrich Rudofsky
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