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Fast last digit detection of a dialed telephone number

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Patent

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Fault tolerant service-providing apparatus for use in a telecomm

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Patent

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Fault tolerant telephony control

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate

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Fault tolerant telephony control

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate

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Fault tolerant voice processing system

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate

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Frequency deviation detecting apparatus and frequency...

Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate

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