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Telephone dialing apparatus

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialing arrangement

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialing device and the operating method thereof

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialing system

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialing system

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialing system with error indicating function

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialler with a personalized page organization of telep

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialler with a personalized page organization of telep

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone dialler with easy access memory

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Telephone dialler with fast access telephone directory and "call

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone equipment for reduced key operations

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone for retrieving memory content through simple...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Telephone having an internally lit display

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Telephone having hand-set to be used also as voice...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Telephone having receive call indicating function and mute/light

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone headset on-line indicator

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Telephone identification calling apparatus and procedures

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate

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Telephone including an electromechanical transducer, method of a

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Telephone instrument

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Telephone instrument

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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