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There's an interesting story related to the 50hz - apparently the WW2-era "Chain Home" RDF (later radar) network used a pulse rate derived from it. Result being that an attempt by Germany to take a closer look (using a Zeppellin airship stuffed with recievers) was a complete flop - they either looked in the wrong frequencies or thought the pulses they were picking up were some weird electrical noise from the mains power supply!
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