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переключатель направления тока stresses
auto.	reversing commutator
construct.	pole-changer switch
el.	pole-changing switch
electr.eng.	reversing key
metrol.	current-polarity-reversal switch
tech.	reversing switch; current reverser; current-reversing key; reverse key

переключатель направления тока: 3 phrases in 3 subjects

Electrical engineering	1
Electronics	1
Technology	1