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jan 1, 1870 - Quadruplex telegraph

Description:

Thomas Edison invents the quadruplex telegraph after becoming a well-known inventor. The quadruplex telegraph could transmit to signals in two different directions on the same wire.

Added to timeline:

Thomas Edison

ByEmma
14 Nov 2017
1
0
675

Date:

jan 1, 1870
Now
~ 156 years ago
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