αγωγός, σωλήνας, αέριο, βενζίνη, βιομηχανία, εργοστάσιο, ατσάλι, κατασκευαστική βιομηχανία, τεχνολογία, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, εξοπλισμός
Public Domain
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