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mar 27, 1930 - Overhead Projector

Description:

Initially used by the U.S military for training purposes in WWII, overhead projectors quickly spread to schools and other organizations around the country.

Added to timeline:

EME

ByDayanira Feliciano
14 Nov 2017
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0
565

Date:

mar 27, 1930
Now
~ 95 years ago

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