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Warning Siren Companies

W.S. Darley & Co
Sirens include: Darley series
Website: https://www.edarley.com/outdoor-warning-sirens/
Sample video: https://www.youtube.com/watch?v=dXUImNKzFo8
Alerting Communicators of America (Defunct)
Sirens include: Allertor 125, Cyclone and Hurricane series
(See also: American Signal Corporation)
Website: http://alertingcommunicators.com
Sample video: https://www.youtube.com/watch?v=fpeJq_vk08U
Sentry
Sirens include: Sentry series (10V, 3V8, etc) and Sterling series
Website: https://www.sentrysiren.com/
Sample video: https://www.youtube.com/watch?v=KRaAU_w3ZGg 
Whelen
Sirens include: WPS series, Hornet and 3000 series
Website: https://www.whelen-engineering.com/mass/
Sample video: https://www.youtube.com/watch?v=pUrMrnI1sgw  
American Signal Corporation
Sirens include: Tempest series (T-128, T-135, etc)
(replaced Alerting Communicators of America)
Website: https://www.americansignal.com/
Sample video: https://www.youtube.com/watch?v=51XRzIAVmwg  
Federal Signal
Sirens include: Thunderbolt series, STH-10 and 2001 series
Website: https://www.fedsig.com/
Sample video: https://www.youtube.com/watch?v=-EZQbGQqck0