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AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
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dec 11, 1841 - the classroom chalkboard was first introduced.

Added to timeline:

2 months ago
0
0
14
laurens timeline ed tech
ed tech 10-17-18

Date:

dec 11, 1841
Now
~ 177 years ago
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