Simplex 4903-9217 Category : Simplex This rectangular Simplex notification appliances has an electromechanical horn mechanism, rather than an electronic horn mechanism or a speaker. Brand SimplexModel 4903-9217Manufacturer SimplexType Alarm (Horn/Strobe, 4-wire)
Gaylord NC-1357A Category : GaylordThis is a rebranded EST/Edwards 270-SPO for use in some sort of ventilator system.
Notifier N-ANN-80 Category : NotifierThis device is part of a permanent mini system installed in my house.
