[GreenKeys] Where was the "Telegraph" in AT&T?

[Bruce Gentry]

For a few weeks I have been viewing YouTube videos of the Connections 
Museum in Seattle, Wa. They are a living museum of telephone gear, 
especially the central office switching systems. They also have a 
display of operational Teletypes. However, how did one send a telegram 
via AT&T? Were the machines for communications within the telephone 
network offices only? For decades I have enjoyed the machines, but aside 
from Western Union and private networks on railroads, know very little 
else about how AT&T carried messages and who they carried them for.

    Bruce Gentry, KA2IVY

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