As it is well known secret services are a very well diffused practise, especially useful during war, or more generally in periods of international tension.. In the link below you can find an interesting collection of photos of devices used by various agencies in the world during the 20th century, such as chiper machines, spy equipement, radio, telegraph machines etc...
http://ciphermachines.com/photos/index.php
The argument of this post is related to the ones contained in Secret Services & Spy Sets, Secret Services & Patents: The Enigma Machine, Secret Services & The Enigma Machine, Secret Services & Radio, Secret Services & Cracking Enigma: The Bombe, Secret Services & Bombe 2.0, Telegraph & Morse Code, Minicameras 2.0 and in Minicameras...micro optics at the service of the spies
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