4. Telephonic communications
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DTMF download technique for digital telephone devices

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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DTMF transmission and displaying method for facsimile system

Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent

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Dual connection mode equipped communication control apparatus

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

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Dual IP phone and method of telecommunicating by using the same

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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Dual mode phone line interface

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

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Dual-band modem and service

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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Dual-circuit telephony

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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Dual-tone multi-frequency signal transfer protocol

Telephonic communications – Telephone line or system combined with diverse electrical...
Patent

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Dynamic callback technique

Telephonic communications – Telephone line or system combined with diverse electrical... – Polling
Patent

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Dynamic callback technique

Telephonic communications – Telephone line or system combined with diverse electrical... – Polling
Patent

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Dynamic frequency passband switching in home phone-line...

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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Dynamically changeable menus based on externally available data

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

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Dynamically configurable communications network

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

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