Hagelin B-21
The B-21 is an Electromechanical cipher machine, B-21 was an developed by Boris Hagelin in late 1925, whilst working in a Arvid Gerhard Damm's company A B Cryptograph in Stockholm,Sweden. The Cipher Machines B-21 was under production for many years, but even after the activities had been taken over by Hagelin's own company A B ngeniörsfirman Teknik after some time it became A.B. Cryptoteknik, the first in Stockholm (Sweden) and later also in Zug (Switzerland) as Crypto AG. The B-21 was available in many different versions.