πόλος ισχύος, ηλεκτρικός μετασχηματιστής, ηλεκτρικός μετασχηματιστής τοποθετημένος σε πόλο, μπλε, ηλεκτρική ενέργεια, γραμμή ρεύματος, ατσάλι, μέταλλο, Πόλος, εξοπλισμός, παραγωγή καυσίμων και ηλεκτρικής ενέργειας
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