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Matsushita Electric Industrial Co., Ltd.
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Kenzo Ohno
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G06 - COMPUTING CALCULATING COUNTING
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ISDN Terminal equipment
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Patent number 5,365,517
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Issue date Nov 15, 1994
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Ricoh Company, Ltd.
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Tamiko Kato
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Issue date Aug 11, 1992
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Ricoh Company, Ltd.
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Hirohisa Saito
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