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The Simplex 4903 Series of Fire Alarms!
What's known as the Simplex 4903 series of commercial fire alarms is one of the most iconic series of alarms to collect, as they were constantly updated in the 1990s. This series includes horns, strobes, speakers, different combinations/styles, and more. Check out this video to see more: https://youtu.be/F0NPu--FaeI Devices seen in this video ...
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