Hisashi Fujisaki

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Band-pass filter

Wave transmission lines and networks – Coupling networks – Frequency or time domain filters and delay lines utilizing...
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Branched telephone system

Telephonic communications – Audio message storage – retrieval – or synthesis
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Loudspeaking telephone system

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Loudspeaking telephone with a frequency shifting circuit

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
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Noise-free terminal station compatible with existing master stat

Telephonic communications – Private or single line system – With central power source
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Profile ID: LFUS-PAI-P-92657

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