ηλεκτρική ενέργεια, υψηλής τάσης, σταθερή τηλεφωνία, ενέργεια, Πυλώνας υψηλής τάσης, κατάρτι, μονωτές, καλώδια, μπλε, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, γραμμή ρεύματος
Public Domain
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