1 ene 1923 año - The radio was first used by Haaren High School in New York City in the classroom for teaching.
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By Duncan Rawlinson (Flickr.com - image description page) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
Añadido al timeline:
A Brief History of Educational Technology
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