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Electronic blackboard
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Patent number 5,181,129
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Issue date Jan 19, 1993
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Hitachi, Ltd.
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Kunio Sato
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Recording apparatus
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Patent number 4,654,677
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Issue date Mar 31, 1987
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Hitachi, Ltd.
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Masaharu Tadauchi
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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Signal processing system and the method
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Patent number 4,594,733
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Issue date Jun 10, 1986
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Nippon Telegraph & Telephone Hitachi Ltd & Public Corporation
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Minoru Kanzaki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Thermal recording method
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Patent number 4,149,171
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Issue date Apr 10, 1979
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Hitachi, Ltd.
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Kunio Sato
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G01 - MEASURING TESTING