Υπολογισμούς στο Διοικητικό Συμβούλιο - Φωτογραφίες & Εικόνες Αρχείου

Teacher making calculations on a blackboard with a book in his hand

Teacher writing on a blackboard with a book in his hand

Businessman sketching the solution of a labirinth

Businessman sketching a light bulb on a glass

Businessman sketching a light bulb on a glass. New ideas