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signalisation à fréquences vocales
commun., IT	audio frequency signaling; audio frequency signalling; voice-frequency signaling; voice-frequency signalling
IT	VF-signaling; VF-signalling; voice frequency signaling; voice frequency signalling
telecom.	vf signalling; VF/AF signaling

signalisation à fréquences vocales: 4 phrases in 2 subjects

Communications	2
Electronics	2