Simplex 4904-9103 Category : Simplex This is the ceiling-mount version of the Simplex 4904-9101 remote strobe. Brand SimplexModel 4904-9103Manufacturer SimplexType Alarm (Remote Strobe)
Simplex 4904-9139 Category : SimplexI believe that this strobe plate was designed to be used with bells, such as the Simplex 2901-9333.
RSG RMS-1T Category : RSGEither this is an early generation RSG T-Bar or some unique variant of the more common RSG RJRMS-1T-KL.
