| http://www.w3.org/ns/prov#value | - , a closed chamber, and a vacuum pump, I air humidifying means including a body of water, conduits for conducting ambient air through said valve, said body of water, and into and out of said chamber responsive to operation of said pump, means for regulating the rate of flow of said air through said chamber, and means for heating said flowing air responsive to a drop in temperature in said chamber
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