световой сигнал, имеющий различную яркость в дневное и ночное время
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[Я.Н.Лугинский, М.С.Фези-Жилинская, Ю.С.Кабиров. Англо-русский словарь по электротехнике и электроэнергетике, Москва, 1999 г.]
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
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