λάμπα, ενέργεια, ηλεκτρική ενέργεια, ιδέα, καινοτομία, νομίζω, ερώτηση, φως, τεχνολογία, μεμονωμένο αντικείμενο, εξοπλισμό φωτισμού
Public Domain
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