ηλεκτρική ενέργεια, μονωτές, γραμμή ρεύματος, μπλε, μέταλλο, ατσάλι, παροχή ηλεκτρικού ρεύματος, εξοπλισμός, κίνδυνος, γκρο πλαν, βιομηχανία
Public Domain
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