Federal Signal Corporation is an American safety signal and siren manufacturer. They produce various siren models.
Currently produced models
Federal Signal Modulator
The Modulator (alternatively called the Modulator Speaker Arrays) is an electronic siren manufactured by Federal Signal.
Federal Signal Model 2
The Model 2 is an omnidirectional electromechanical siren that has been in production since 1929, and is the oldest siren still produced by Federal signal.
Discontinued models
Federal Signal Thunderbolt
The Thunderbolt was a rotational electromechanical siren that was produced from 1952 to 1990.
Federal Signal 3T22/2T22
The 2T22/3T22 were omnidirectional sirens produced from 1952 until sometime in the 1990s. The 3T22 has a damper that allows it to produce a Hi-Lo signal.
SiraTone EOWS series
The SiraTone series (also known as the EOWS series) were a series of rotational and omnidirectional sirens that were produced sometime in the 1980's until the introduction of the Modulator.
Models produced
See also Federal Signal Corporation American Signal Corporation Civil defense siren
Notes
References
Further reading https://wiki.airraidsirens.net/XT22 https://wiki.airraidsirens.net/Federal_Signal_Corporation https://www.fedsig.com/