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30 agos 1931 año - the overhead projector was widely used by the U. S. Military to train forces during World War II and eventually the device spread to schools.
Añadido al timeline:
laurens timeline ed tech
By
lauren smith
18 oct 2018
0
0
177
fecha:
30 agos 1931 año
Ahora mismo
~ 92 years ago
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