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Writing board
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Patent number 5,957,700
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Issue date Sep 28, 1999
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Ricoh Elemex Corporation
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Kenzo Ariyama
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Wet-type image formation apparatus
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Patent number 5,463,453
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Issue date Oct 31, 1995
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Ricoh Company, Ltd.
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Tsuneo Kurotori
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Wet-type image formation apparatus
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Patent number 5,021,834
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Issue date Jun 4, 1991
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Ricoh Company, Ltd.
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Ichirio Tsuruoka
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Wet type image forming apparatus
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Patent number 4,905,047
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Issue date Feb 27, 1990
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Ricoh Company, Ltd.
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Kenzo Ariyama
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Electrostatic copying apparatus
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Patent number 4,294,535
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Issue date Oct 13, 1981
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Ricoh Company, Ltd.
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Kenzo Ariyama
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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