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Circular fluorescent lamp
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Patent number 5,034,655
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Issue date Jul 23, 1991
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Hitachi, Ltd.
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Seiichi Murayama
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H01 - BASIC ELECTRIC ELEMENTS
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Lighting lamp
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Patent number 4,991,074
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Issue date Feb 5, 1991
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Tomoegawa Paper Co., Ltd.
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Yasuo Kobayashi
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H01 - BASIC ELECTRIC ELEMENTS
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Lighting lamp
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Patent number 4,954,937
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Issue date Sep 4, 1990
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Tomoegawa Paper Co., Ltd.
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Yasuo Kobayashi
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H01 - BASIC ELECTRIC ELEMENTS
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