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In the early 1950s, Swedish company AB Transvertex developed the
HC-9 cipher machine for the Swedish Army. It's a fully mechanical
machine that physically resembles Hagelin cipher machines, such as
the M-209.
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Unlike the Hagelin machines, however, it uses a punched card instead
of pin-wheels and the internal mechanics use a completely different
principle.
The machine remained in service until the late 1970s.
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Not much is currently known about the Swedish company Transvertex or
the HC-9 cipher machine. A detailed description was given by
Deavours and Kruth in Cryptologia Volume XIII, number 3 of July 1989.
If you have any more information about the company or about this
machine, please contact us.
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