Researching of a MULTIPLE TELEGRAPH (20 дек 1865 г. – 9 окт 1874 г.)
Описание:
During his early years Graham spend his knowledge about sound and music, looking for a way to transmit multiple messages over the same wire at the same time.Добавлено на ленту времени:
Дата:
20 дек 1865 г.
9 окт 1874 г.
~ 8 years and 9 months
