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My middle brother once worked at a steel mill near El Paso,Texas.His job was down in a pit,cutting white-hot steel as it emerged from extrusion dies.He wore an insulated asbestos fire suit,equipped with a vortex-tube for cooling.He claimed that it required a remarkable amount of air(pressure and volume) to make the thing operate.I know thats a very subjective comment,buts thats all I have.
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