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30 agos 1931 anni - 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.
Aggiunto al nastro di tempo:
18 ott 2018
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laurens timeline ed tech
ed tech 10-17-18
Data:
30 agos 1931 anni
Adesso
~ 92 years ago