• A Civil Defense siren made in 1952.
    Models
    [Thunderbolt] 1000: single toned chopper that can do Alert and Attack signal
    Thunderbolt 1000T: a dual toned version of the Thunderbolt 1000
    Thunderbolt [1003]: a dual toned chopper with solenoids that gives it the ability to do the [Hi-Lo] signal


    Thunderbolt siren meaning & definition 1 of Thunderbolt siren.

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