The History Of Sentry Siren 

This is the history of Sentry Siren. In this video, I explain how Sentry became one of the siren powerhouses we know today. I cover both the single-rotor and dual-rotor sirens that are/were being made. I also cover the port ratios. I didn't cover the electronic sirens that Sentry makes because I am going to be making a video exclusively about the types of electronic sirens there are on the market.
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sentry, siren, history