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1 gen 1841 anni - Classroom Chalkboards

Descrizione:

While classroom chalkboards were introduced in 1841, it was not until the end of the 1800's that they were included in all schools. Horace Mann was a major advocate.

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ByKate Belt
24 ott 2018
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379

Data:

1 gen 1841 anni
Adesso
~ 184 years ago
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