Simplex 2098-9806 Category : SimplexThis device is a permanent fixture in my Simplex 4004 wall system.
Space Age AV32+2DCD Category : Space Age ElectronicsThat is an electromechanical horn on the rear of the strobe plate.
Radionics D571S Category : OtherI always associate these re-branded Wheelock AS’s with Walmart. I’m sure others out there can also understand.