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Three-way light dimmer switch
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Patent number 4,259,619
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Issue date Mar 31, 1981
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Power Controls Corporation
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Bill R. Wall
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Power regulator
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Patent number 4,117,445
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Issue date Sep 26, 1978
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National Electric Corporation
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Luther M. Foreman
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H01 - BASIC ELECTRIC ELEMENTS
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Electric power controller
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Patent number 3,990,033
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Issue date Nov 2, 1976
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Power Controls, Corporation (Entire)
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Bill R. Wall
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H01 - BASIC ELECTRIC ELEMENTS