Frederik Van Dongen

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Arrangement for applying a ringing voltage to a subscriber's lin

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Electronic telephone set

Telephonic communications – Substation or terminal circuitry – Amplifying
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Telephone set comprising a line voltage stabilizer having a DC s

Telephonic communications – Substation or terminal circuitry – Conversion of signal form
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Transmission circuit for a DTMF-telephone set

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Profile ID: LFUS-PAI-P-281698

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