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Rotating Sirens - Which was first?

https://www.airraidsirens.net/forums/viewtopic.php?t=16489

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Re: Rotating Sirens - Which was first?

Posted: Sun May 25, 2014 8:59 pm
by Antiwhoknows
They rotated on their turntable at 2rpm off a gear reducer driven by their engine.
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