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3924265
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Issue date Dec 2, 1975
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3791024
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H01 - BASIC ELECTRIC ELEMENTS
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3749987
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H01 - BASIC ELECTRIC ELEMENTS
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3549432
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Patent number 3,549,432
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Issue date Dec 22, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3359467
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Issue date Dec 19, 1967
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H01 - BASIC ELECTRIC ELEMENTS