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There are more uses of air cooled heat exchangers, like the upstream production, refineries and petro-chemical facilities. It can also be employed on situations rich in temperature, high pressure, corrosive fluids and environments. Moreover, air coolers could possibly be equipped and found in oil and coal refineries; compressor stations for gas pipelines; subsurface gas storage facilities; plants producing polychlorvinyl, polyethylene, glass fiber, biplastic; caustic soda plants; by-product coke plants and ammonia transportation and handling plants. The Walter Kindle Company first invented the fractional co2 extinguisher in 1924 with the request in the Bell Telephone Company. Bell had been having difficulty locating a dry chemical extinguisher which could effectively extinguish the electrical fires that sometimes broke out on early telephone switchboards. The CO2 proved particularly efficient at controlling electrical fires, in addition to their popularity quickly grew during the entire industrial sector.