Gerät 32620 was a digital speech generator, developed in the early 1980s […] and was used by the Stasi for sending secret coded messages via the mysterious numbers stations that used to be operated on the short wave radio bands. The device is known by different names, including Eiserne Frau (iron lady) and Stimme (Voice).

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Reference:

1. Crypto Museum
2. Device 32620 Stimme