Antique circa 1895 engraving, illustration of a Patent Electrical Exchange System in 1879. A telephone exchange is a telecommunications system used in the public switched telephone network or in large enterprises. An exchange consists of electronic components and in older systems also human operators that interconnect (switch) telephone subscriber lines or virtual circuits of digital systems to establish telephone calls between subscribers.
SOURCE: ORIGINAL 19th CENTURY ENGRAVING.
Size: 5877px × 4045px
Photo credit: © Old Paper Studios / Alamy / Afripics
License: Licensed
Model Released: No
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