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регулируемый автотрансформатор stresses
automat.	variable autotransformer
brit.	moving-coil voltage regulator
el.	adjustable autotransformer; varitran
Makarov.	variable-ratio autotransformer
O&G, oilfield.	variable ratio autotransformer
tech.	adjustable-ratio autotransformer
tradem.	variac

регулируемый автотрансформатор: 2 phrases in 2 subjects

Electrical engineering	1
Telecommunications	1