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circuit de secours
commun.	v.f.t. reserve circuit; fall back circuit
energ.ind.	back-up circuit
transp.	emergency circuit
transp., avia.	emergency power supply
circuit de secours pour la télégraphie harmonique
telegr.	nominated reserved circuit

circuit de secours : 5 phrases in 3 subjects

Automated equipment	2
Mineral products	1
Transport	2