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Unterspannung f =
gen.	undervoltage; power sag
construct.	underlay
el.mach.	low tension; under-voltage; under-tension
met., el.	secondary voltage
phys.	undertension
tech.	low voltage; low voltage rating; lower voltage; minimum stress

Unterspannung: 3 phrases in 2 subjects

Optics branch of physics	1
Transport	2