FR868742A - Dispositif téléphonique accessoire pour la transmission télégraphique au cours d'un entretien téléphonique de certains mots de cet entretien
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Dispositif téléphonique accessoire pour la transmission télégraphique au cours d'un entretien téléphonique de certains mots de cet entretien
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H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
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Engineering & Computer Science
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Signal Processing
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FR868742D1939-03-091940-03-07Dispositif téléphonique accessoire pour la transmission télégraphique au cours d'un entretien téléphonique de certains mots de cet entretien
ExpiredFR868742A
(fr)