Build a Photophone
17.5 هزار بار بازدید -
10 سال پیش
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Alexander Graham Bell did not
Alexander Graham Bell did not consider the telephone to be his greatest invention. This video takes a look at this remarkable man and what he considered to be his greatest invention: the photophone.
10 سال پیش
در تاریخ 1393/07/28 منتشر شده
است.
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