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5 май 1841 г. - Blackboard

Описание:

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.

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Educational Timeline

Bymolly
4 дек 2017
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0
426

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5 май 1841 г.
Сейчас
~ 184 г назад
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