ηλεκτρική ενέργεια, ενέργεια, δύναμη, καλώδια, καλωδίωση, στήλες, ιστούς, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, ηλεκτρικό πυλώνα, γραμμή ρεύματος, μπλε
Public Domain
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