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Packet switching system
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Patent number 5,181,199
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Issue date Jan 19, 1993
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Hitachi, Ltd.
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Yuko Motoki
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Memory cartridge
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Patent number 4,872,091
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Issue date Oct 3, 1989
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Ricoh Company, Ltd.
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Yoshio Maniwa
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G06 - COMPUTING CALCULATING COUNTING
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Time-division switching unit
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Patent number 4,543,652
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Issue date Sep 24, 1985
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Hitachi, Ltd.
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Eiichi Amada
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H04 - ELECTRIC COMMUNICATION TECHNIQUE