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Multipurpose headset amplifier

Telephonic communications – Terminal accessory or auxiliary equipment – With circuit connection to terminal
Patent

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Multipurpose hinge apparatus for foldable telephones

Telephonic communications – Terminal – Housing or housing component
Patent

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Multipurpose subscriber local line monitoring device

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent

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Multirate speech codecs

Telephonic communications – Substation or terminal circuitry
Reexamination Certificate

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Multisensing circuitry for class signals and stutter dial tone i

Telephonic communications – Audio message storage – retrieval – or synthesis
Patent

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Multisensing circuitry for class signals and stutter dial...

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

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Multiuse telecommunications power system

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Multivariate rate-based overload control for multiple-class...

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

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Multiwire-pair telecommunications test system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set
Patent

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Musicians telephone interface

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

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Mute status reminder for a communication device

Telephonic communications – Special services – Service trigger
Reexamination Certificate

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Muting circuit for telephone answering machine

Telephonic communications – Audio message storage – retrieval – or synthesis
Patent

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Muting conference call hold music

Telephonic communications – Special services – Conferencing
Reexamination Certificate

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