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backward signal
commun.	Rückwärtszeichen n (signal transmitted against the direction of call setup)
comp.	Hinteransicht f; rückwärtiges Signal
el.	Rückwärtszeichen n
backward signalling
commun., IT	Zeichengabe in Rückrichtung
el.	rückwärtige Zeichengabe

backward signal : 3 phrases in 2 subjects

Communications	2
Electronics	1