We describe the many advances in spy radios during and after WWII, starting with the huge suitcase B2 suitcase transceiver, through several stages of miniaturization and eventually down to small modules a few inches in size just after the War. A top secret set known as the S-Phone was a VHF full duplex radiotelephone. It was used by clandestine agents and Partisans for communications with ships and planes. The surprising sophistication and fast engineering development of these radios will be illustrated with photographs and schematics from the collection of the Crypto-Museum. This multimedia presentation has vintage 1940s music and original WWII propaganda posters.
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