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1794499
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Issue date Mar 3, 1931
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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1742600
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Patent number 1,742,600
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Issue date Jan 7, 1930
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F21 - LIGHTING
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1742601
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Patent number 1,742,601
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Issue date Jan 7, 1930
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F21 - LIGHTING
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1595753
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Patent number 1,595,753
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Issue date Aug 10, 1926
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F21 - LIGHTING
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1591211
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Patent number 1,591,211
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Issue date Jul 6, 1926
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F21 - LIGHTING
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1417935
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Patent number 1,417,935
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F21 - LIGHTING