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  • The Life of Fire Extinguishers Pressure Contained & Dry Chemicals all over the world:) :( :o...In structure of Fire Extinguishers there is a top pin to press under by the grips of fire extinguishers which can let the pressurized dry chemicals with Nitrogen gas(normally 7-9kgf/cm2) erupt through the hole inside the valves of fire extinguishers...Originally the Nitrogen gas contains
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