πόλος ισχύος, ηλεκτρικό πόλο, ηλεκτρικό πυλώνα, μπλε, ατσάλι, κατασκευαστική βιομηχανία, ηλεκτρική ενέργεια, βιομηχανία, τεχνολογία, γκρο πλαν, μέταλλο
Public Domain
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