From The Analyst:
No analysis of emerging defense technology would be complete without a nod to its humble beginnings. To this end, I have found an old documentary which discusses the development and use of electronic warfare during World War II. What is really fascinating about material like this is observing just how advanced the applications were and how little the basic principles have changed
Clear an hour or so of your time and read on to watch this incredible documentary.
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My Comment: I actually sat down and watched this collection of videos .... and I was captivated. The first 10 minutes are above, the rest you will have to go to the link.