Simplex 4901-9822 This is an electronic horn, not an electromechanical horn or a speaker. Brand SimplexModel 4091-9822Manufacturer SimplexType Alarm (Horn)
Edwards 270-GAO Category : EST/EdwardsThis is the original version of the 270-GAO. It is essentially the same as the newer version of the EST...
Gamewell A8814 Category : GamewellI have no idea what year this alarm is from, only that it’s old and heavy.