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H01 - BASIC ELECTRIC ELEMENTS
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C03 - GLASS MINERAL OR SLAG WOOL
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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2468836
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H01 - BASIC ELECTRIC ELEMENTS
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2309642
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H01 - BASIC ELECTRIC ELEMENTS
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2290086
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H01 - BASIC ELECTRIC ELEMENTS
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2238712
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Patent number 2,238,712
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Issue date Apr 15, 1941
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H01 - BASIC ELECTRIC ELEMENTS
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2075355
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Patent number 2,075,355
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H01 - BASIC ELECTRIC ELEMENTS
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2051457
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Patent number 2,051,457
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Issue date Aug 18, 1936
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H01 - BASIC ELECTRIC ELEMENTS
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2041292
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H01 - BASIC ELECTRIC ELEMENTS
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1990728
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Patent number 1,990,728
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H01 - BASIC ELECTRIC ELEMENTS
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1928370
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Issue date Sep 26, 1933
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H01 - BASIC ELECTRIC ELEMENTS