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переключатель полюсов stresses
media.	change-over-switch
shipb.	pole change
tech.	changeover switch; pole changer; pole reverser; pole-changer switch; pole-changer; pole-changing switch; battery commutator
telecom.	change-over selector
переключатель полюса
el.	pole charger

переключатель полюсов: 5 phrases in 2 subjects

Electronics	2
Technology	3