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26th July 2008
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Before Radar - continued .....
A number of sites give some detailed historic information about the development of the early sound detection systems and are well worth visiting and reading.
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Inventors & Inventions
IF IN DOUBT ASK !!!!
There have been a great variety of devices that used acoustic (sound) detection for ranging - ( distance and direction finding )

Checking some of these sites and images should be informative as well as fun.
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