Simplex 4903-9105 Category : Simplex I think that this strobe plate actually uses the same housing that the Simplex 4903-9101 uses. The strobe is obviously different. Brand SimplexModel 4903-9105Manufacturer UnknownType Alarm (Strobe Plate)
Simplex 4904-9139 Category : SimplexI believe that this strobe plate was designed to be used with bells, such as the Simplex 2901-9333.
Federal Signal 950B Category : Federal SignalI’m not sure why there is a transformer on the side of this alarm.
Siemens CH-MC-W Category : SiemensThis is basically the white, Siemens-branded version of the Wheelock CH70-24MCW.
