σύννεφα, Πόλος, ηλεκτρική ενέργεια, ουρανός, κατασκευαστική βιομηχανία, μπλε, βιομηχανία, ατσάλι, εξοπλισμός, γερανός, μηχανήματα κατασκευής
Public Domain
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