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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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30 авг 1931 г. - 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.
Добавлено на ленту времени:
laurens timeline ed tech
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lauren smith
18 окт 2018
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30 авг 1931 г.
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~ 94 г назад
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