[GreenKeys] Western Union Simplex Printer Wiring Cabinet 2-B : Looking for Documentation.

[Jim Haynes]

On Thu, 7 Jul 2022, Charles Baetsen wrote:

> It is definitely not identical to the 2-R, but close. The 2-R does have
> jacks like that.
> 
Lots of things have jacks like that.  That jack box goes back to Morse
telegraph days when it was used as a rudimentary switchboard with a
shorting plug going into a jack.  I guess they had lots of them left over
when Morse went out and started using them for printer jacks.