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Locking plug
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Patent number 4,241,969
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Issue date Dec 30, 1980
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Harvey Hubbell, Incorporated
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Michael J. D'Amato
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H01 - BASIC ELECTRIC ELEMENTS
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Electrical contact assembly
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Patent number 4,193,660
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Issue date Mar 18, 1980
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Harvey Hubbell, Incorporated
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Frank C. Jaconette
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H01 - BASIC ELECTRIC ELEMENTS
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Electric cord clamp device
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Patent number 4,138,185
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Issue date Feb 6, 1979
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Harvey Hubbell, Incorporated
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Frank C. Jaconette
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H01 - BASIC ELECTRIC ELEMENTS