4. Telephonic communications
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Zero crossing detection circuit

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

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Zero-delay structure for sub-band echo cancellation

Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate

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Zone registration of a mobile in a mobile telephone system

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent

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Zoned microcell with sector scanning for cellular telephone syst

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

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