4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal receiver

Shuichi Yoshikawa

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Automatic sound gain control device and a sound recording/reprod

Boots – shoes – and leggings
Patent

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DTMF signal judging apparatus

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

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DTMF signal judging apparatus

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

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DTMF signal receiving apparatus equipped with a DTMF signal judg

Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent

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IC card with built-in voice synthesizing function

Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent

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Profile ID: LFUS-PAI-P-495575

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