File:Dioptra - ESP.jpg

Αυτό το έργο είναι κοινό κτήμα στη χώρα προέλευσής του και άλλες χώρες και περιοχές όπου η διάρκεια πνευματικών δικαιωμάτων είναι όσο η ζωή του δημιουργού και μέχρι 70 χρόνια μετά ή λιγότερο.

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