4 videos have been uploaded to YouTube showing the actual machine behind all the various East-German numbers stations and its operation.
The four videos show the Spanish voice behind the Atencion Numbers Station, the German Voice behind the East German numbers stations, how to operate the machine manually and how to operate the machine with tape.
They can be viewed at:
http://www.youtube.com/profile?user=PeterStaal01#g/u
Info via dxld