1 янв 1960 г. - By the 1960s, overhead projectors were commonly used in schools.
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By mailer_diablo (Self-taken (Unmodified)) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia CommonsДобавлено на ленту времени:
Дата:
1 янв 1960 г.
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~ 65 г назад