4. Telecommunications
  5. Receiver or analog modulated signal frequency converter
  6. Signal selection based on frequency

Yoshiteru Ishii

Inventor

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Telephone apparatus

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

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Tuner circuit

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent

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Profile ID: LFUS-PAI-P-1020388

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