4. Telephonic communications
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Low-pass filters for splitterless pots and data transmission

Telephonic communications – Line equalization or impedance matching
Patent

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Low-power reconfigurable hearing instrument

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Low-power wireless system for telephone services

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

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Low-powered remote sensor

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent

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Low-powered remote sensor and telephone line transmitter

Telephonic communications – Telephone line or system combined with diverse electrical... – Remote indication over telephone line
Patent

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Low-profile speakerphone with downward oriented microphone confi

Telephonic communications – Terminal – Having loudspeaking conversation capability
Patent

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Low-voltage transistor circuit for suppressing high-voltage...

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Lower casing structure of payphone

Telephonic communications – With check operated control
Patent

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LPC-based DTMF receiver for secondary signalling

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

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