πόλους ισχύος, ηλεκτρική ενέργεια, γραμμές εναέριας μεταφοράς, ηλεκτρικά καλώδια, υψηλής τάσης, παροχή ηλεκτρικού ρεύματος, ρεύμα, ενέργεια, εναέρια γραμμή
Public Domain
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