Federal developed them for factories like steel mills where there was a possibility of fire (hence explosion proof). Even the military used them for things like battleships for sirens to warn everyone that the cannons were about to fire.sheppardpat47 wrote: ↑Wed Sep 22, 2021 12:14 pmExactly, explosion proof air raid siren, mostly for inside use I think since of its size, I think it's the kind of sirens that they use in big factories
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