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2. Federal Signal Modulator - Wikipedia

   en.wikipedia.org/wiki/Federal_Signal_Modulator

   Federal Signal Modulators (also known as Modulator Speaker Arrays) are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars, tsunamis, or any other disaster. They are identified mostly by their distinctive stacked "flying saucer" design.

3. Fire alarm notification appliance - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_notification...

   A Simplex-brand fire alarm bell. A fire alarm notification appliance is an active fire protection component of a fire alarm system.A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action.

4. Motorola Minitor - Wikipedia

   en.wikipedia.org/wiki/Motorola_Minitor

   Amplified base unit - An optional "Charger/Amplifier" base can be bought. Bigger than the standard charging stand, the "Charger/Amplifier" base not only charges the pager, but has an external antenna for increased reception , an amplified audio out jack to drive a stand-alone speaker, and some models even incorporate a relay to activate ...

5. Fire alarm system - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_system

   A fire alarm control panel Fire alarm speaker and pull station. Fire alarm systems are composed of several distinct parts: Fire alarm control panel (FACP), or fire alarm control unit (FACU): This component, the hub of the system, monitors inputs and system integrity, controls outputs, and transmits information.

6. Wheelock (brand) - Wikipedia

   en.wikipedia.org/wiki/Wheelock_(brand)

   However, many fire alarm control panels are compatible with Cooper Wheelock's line of notification appliances and other products. Wheelock also produces notification devices for Siemens Building Technologies for its fire alarm systems [4] such as the Cerberus Pro Modular. These notification devices manufactured for Siemens are the same device ...

7. Siren (alarm) - Wikipedia

   en.wikipedia.org/wiki/Siren_(alarm)

   Two early fire siren manufacturers were William A. Box Iron Works, who made the "Denver" sirens as early as 1905, and the Inter-State Machine Company (later the Sterling Siren Fire Alarm Company) who made the ubiquitous Model "M" electric siren, which was the first dual tone siren.