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overhead projector

1930 (Invention of the Overhead Projector). This allowed teachers to show work and information to the whole class at once.

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Uploaded on January 28, 2015

overhead projector

1930 (Invention of the Overhead Projector). This allowed teachers to show work and information to the whole class at once.

156 views
0 faves
0 comments
Uploaded on January 28, 2015
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