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Wall box dimmer
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Patent number 5,068,639
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Issue date Nov 26, 1991
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Valmont Industries, Inc.
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Dail L. Swanson
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Dual voltage ballast
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Patent number 5,001,401
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Issue date Mar 19, 1991
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Valmont Industries, Inc.
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Larry J. Costa
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H01 - BASIC ELECTRIC ELEMENTS
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Ballast
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Patent number 4,916,363
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Issue date Apr 10, 1990
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Valmont Industries, Inc.
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Charles A. Burton
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H01 - BASIC ELECTRIC ELEMENTS
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Three lamp ballast
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Patent number 4,644,227
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Issue date Feb 17, 1987
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General Electric Company
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Edward E. Hammer
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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