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.

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.
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Image Number:  4409-41330Rights ManagedCredit Line:Album/Prisma/Album Archivo/SuperStockCollection:Contributor:Model Release:NoProperty Release:NoResolution:6339×2763
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