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19 h 30 m, 29 mayo 1957 año - The Federal Aid to Education program stimulates sales of overhead projectors

Descripción:

The invent of overhead projectors was a cost effective measure for instructional technology in that it gave a means to present a single document or visual to large numbers without printing multiples.

Añadido al timeline:

Module 1 Assignment

ByChristopher Kibodeaux
16 ene 2018

fecha:

19 h 30 m, 29 mayo 1957 año
Ahora mismo
~ 67 years ago
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