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2673303
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H01 - BASIC ELECTRIC ELEMENTS
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2110603
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H01 - BASIC ELECTRIC ELEMENTS
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1971891
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H01 - BASIC ELECTRIC ELEMENTS
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1903144
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H01 - BASIC ELECTRIC ELEMENTS
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1896651
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Patent number 1,896,651
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H01 - BASIC ELECTRIC ELEMENTS
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1885637
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H01 - BASIC ELECTRIC ELEMENTS
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1831998
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H01 - BASIC ELECTRIC ELEMENTS
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1828346
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Patent number 1,828,346
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H01 - BASIC ELECTRIC ELEMENTS
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1750482
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H01 - BASIC ELECTRIC ELEMENTS
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1740030
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H01 - BASIC ELECTRIC ELEMENTS
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1656898
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H01 - BASIC ELECTRIC ELEMENTS
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1582849
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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1533900
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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1398545
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H01 - BASIC ELECTRIC ELEMENTS
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1355529
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H01 - BASIC ELECTRIC ELEMENTS