System Sensor 2151 Category : System Sensor This smoke detector is fairly rare. Brand System SensorModel 2151Manufacturer System SensorType Smoke Detector (Photoelectric, 4-wire)
Atlas VT-157 Category : Atlas SoundMultiple companies have rebranded this speaker. Atlas Sound is actually the company that manufactures it, however.
Siemens U-EC-MCS Category : SiemensAlthough this alarms looks like an electromechanical horn/strobe produced by Cerberus Pyrotronics/Siemens/Faraday around the same time, it is actually a...
Wheelock ET-1080-WS-24 Category : WheelockYou can’t really tell from the pictures, but the strobe is practically falling out of this particular unit.