4. Telephonic communications
  5. Centralized switching system
  6. Switching controlled in response to called station...

Daniel B. Kelly

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Method and system for distinguishing valid DTMF signals from spu

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

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Telephone loudspeaker enclosure

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1905331

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