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Notstromversorgung f
gen.	emergency power supply
commun.	restricted powering (power feeding)
energ.ind., el.	backup power supply
med.appl.	emergency electric power
microel.	standby supply
tech.	stand-by power supply; emergency power set
telecom.	standby power supply
transp.	standby power supplies
transp., avia.	emergency power

Notstromversorgung : 3 phrases in 2 subjects

Earth sciences	1
General	2