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3760213
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Patent number 3,760,213
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Issue date Sep 18, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3456147
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Patent number 3,456,147
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Issue date Jul 15, 1969
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C03 - GLASS MINERAL OR SLAG WOOL
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2840746
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Patent number 2,840,746
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Issue date Jun 24, 1958
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H01 - BASIC ELECTRIC ELEMENTS
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2616946
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Patent number 2,616,946
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Issue date Nov 4, 1952
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H01 - BASIC ELECTRIC ELEMENTS
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2518848
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Patent number 2,518,848
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Issue date Aug 15, 1950
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H01 - BASIC ELECTRIC ELEMENTS
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2358553
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Patent number 2,358,553
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Issue date Sep 19, 1944
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H01 - BASIC ELECTRIC ELEMENTS
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2312350
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Patent number 2,312,350
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Issue date Mar 2, 1943
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H01 - BASIC ELECTRIC ELEMENTS