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Series ringing signal generator

Telephonic communications – Call signal generating
Patent

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Socket/plug in DTMF tone dialer

Telephonic communications – Call signal generating
Reexamination Certificate

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Software controlled ring voltage generator

Telephonic communications – Call signal generating
Reexamination Certificate

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System and method for providing particularized audible alerts

Telephonic communications – Call signal generating
Reexamination Certificate

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System and method for ringing other subscriber telephones...

Telephonic communications – Call signal generating
Reexamination Certificate

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Systems and methods for generating tones for operating...

Telephonic communications – Call signal generating
Reexamination Certificate

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