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clearing signal
commun.	signal de dégagement; signal de raccrochage
comp.	signal d'effaçage
el.	signal de libération
clear signal
railw., sec.sys.	signal à voie libre
clear-signal
el.	signal de libération

clearing signal : 17 phrases in 4 subjects

Communications	9
Electronics	4
Telecommunications	3
Telegraphy	1