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5 magg 1841 anni - Blackboard

Descrizione:

Introduction of the blackboard was difficult at first just like today's new technology. But it soon was featured in all classrooms and is still used today.

Aggiunto al nastro di tempo:

Educational Timeline

Bymolly
4 dic 2017
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0
431

Data:

5 magg 1841 anni
Adesso
~ 184 years ago
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