Quadruplex telegraph invented by Thomas Alva Edison
Quadruplex telegraph invented by Thomas Alva Edison (1847-1931) in 1874, It could send and receive four telegraph messages simultaneously on a single wire, two signals in each direction, Engraving. (Photo by Prisma/UIG/Getty Images)
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Credit:
Editorial #:
152190804
Collection:
Universal Images Group
Date created:
January 01, 1871
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Not released. More information
Source:
Universal Images Group Editorial
Object name:
953_05_19-857
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6339 x 2763 px (21.13 x 9.21 in) - 300 dpi - 18 MB
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