Elwady High Technology Solutions - Fire alarm system is a system that works to warn and notify people through visual and audio devices when there is smoke, fire, carbon monoxide gas or
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![How smoke detector is made - material, history, used, parts, components, steps, product, machine, History How smoke detector is made - material, history, used, parts, components, steps, product, machine, History](http://www.madehow.com/images/hpm_0000_0002_0_img0190.jpg)