ουρανός, μπλε, σε εξωτερικό χώρο, επικοινωνία, δίκτυο, εξουσία, ηλεκτρική ενέργεια, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, γραμμή ρεύματος, ατσάλι, ηλεκτρικό πυλώνα
Public Domain
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