| http://www.w3.org/ns/prov#value | - The protection circuit includes a... 21 4150415 Energy conservation system An energy conservation system is disclosed wherein power in a given area, such as in a hotel or other room, is controlled by means of an ultrasonic sound transmitter and at least one or more... 22 4118750 Vital relay operating circuit There is disclosed a circuit for energizing a vital relay in response to an input signal t
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