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3919674
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Patent number 3,919,674
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Issue date Nov 11, 1975
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H01 - BASIC ELECTRIC ELEMENTS
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3723924
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Patent number 3,723,924
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Issue date Mar 27, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3453568
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Patent number 3,453,568
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Issue date Jul 1, 1969
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H01 - BASIC ELECTRIC ELEMENTS
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3360751
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Patent number 3,360,751
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Issue date Dec 26, 1967
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H01 - BASIC ELECTRIC ELEMENTS
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3293577
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Patent number 3,293,577
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Issue date Dec 20, 1966
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H01 - BASIC ELECTRIC ELEMENTS
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3162740
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Patent number 3,162,740
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Issue date Dec 22, 1964
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H01 - BASIC ELECTRIC ELEMENTS