lemmy.ca

[Early 1920s] William Box Denver Quadruplex electric siren ( lemmy.ca )

The "Denver Quadruplex" was a very early example of an electric siren, first invented and sold in 1914. The company who built these, the Denver CO-bssed William A. Box Iron Works Company , is generally credited for inventing the first practical electric outdoor warning siren, the Denver Type A, a few years earlier. Surprisingly,...

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