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protective relay
el. συσκευή προστασίας; ηλεκτρονόμος προστασίας; ρελέ προστασίας
 English thesaurus
protective relay
tech. LOR (MichaelBurov); L.O.R. (MichaelBurov)
protective relay: 1 phrase in 1 subject
Mechanic engineering1