Wheelock SR-241575 Category : Wheelock This is an old, vertical model of what is now the RSS. Brand WheelockModel SR-241575Manufacturer WheelockType Alarm (Strobe)
System Sensor 4WT-B Category : System SensorThis 4-wire smoke detector also has a thermal heat sensor.
Gaylord NC-1357A Category : GaylordThis is a rebranded EST/Edwards 270-SPO for use in some sort of ventilator system.
