| http://www.w3.org/ns/prov#value | - In a device as described, the combination of of a humidity influenced assembly including a pair of similar structural elements, a wick covering one of the said elements, means to maintain the wick moist with water, means to subject both elements to circulating air, thermopile wires thermally but not electrically connected to the said elements to be influenced by the difference of temperature betwe
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