Researching of a MULTIPLE TELEGRAPH (20 Dez 1865 Jahr – 9 Okt 1874 Jahr)
Beschreibung:
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.Zugefügt zum Band der Zeit:
Datum:
20 Dez 1865 Jahr
9 Okt 1874 Jahr
~ 8 years and 9 months
