Fumikazu Hamatani

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Communications system having voice and digital data capability a

Multiplex communications – Wide area network – Packet switching
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Control circuitry for key telephone apparatus

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Data transmission apparatus

Pulse or digital communications – Repeaters – Testing
Patent

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Dial impulse relay circuit

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
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Digital telephone set capable of being simultaneously used by a

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
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Profile ID: LFUS-PAI-P-548056

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