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H01 - BASIC ELECTRIC ELEMENTS
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3673539
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H01 - BASIC ELECTRIC ELEMENTS
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3629776
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Patent number 3,629,776
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H01 - BASIC ELECTRIC ELEMENTS
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3601744
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Patent number 3,601,744
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H01 - BASIC ELECTRIC ELEMENTS
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3564475
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H01 - BASIC ELECTRIC ELEMENTS
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3353134
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS