4. Telephonic communications
  5. Polystation line system
  6. Revertive call

Sadaka Mitsuo

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Private branch exchange

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate

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Private branch exchange

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate

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Private branch exchange apparatus

Telephonic communications – Polystation line system – Revertive call
Patent

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Telephone and private branch exchange

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Reexamination Certificate

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Telephone exchange for wire telephone and radio telephone

Telephonic communications – Special services – Call diversion
Patent

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Profile ID: LFUS-PAI-P-1222112

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