IT978218B - Disposizione circuitale per rice vitori di piu frequenze a guadagno regolato in impianti di telecomuni cazioni specie in impianti telefo nici
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Disposizione circuitale per rice vitori di piu frequenze a guadagno regolato in impianti di telecomuni cazioni specie in impianti telefo nici
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Publication number
IT978218B
IT978218BIT1928773AIT1928773AIT978218BIT 978218 BIT978218 BIT 978218BIT 1928773 AIT1928773 AIT 1928773AIT 1928773 AIT1928773 AIT 1928773AIT 978218 BIT978218 BIT 978218B
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Publication of IT978218BpublicationCriticalpatent/IT978218B/it
H04Q1/00—Details of selecting apparatus or arrangements
H04Q1/18—Electrical details
H04Q1/30—Signalling arrangements; Manipulation of signalling currents
H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
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Engineering & Computer Science
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Computer Networks & Wireless Communication
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Noise Elimination
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IT1928773A1972-01-181973-01-17Disposizione circuitale per rice vitori di piu frequenze a guadagno regolato in impianti di telecomuni cazioni specie in impianti telefo nici
IT978218B
(it)
Disposizione circuitale per rice vitori selettivi di segnali di selezione protetti da un funzio namento accidentale causato dalla voce in impianti di telecomunica zioni specie in impianti telefonici