In case you are curious, here's an FGC-30 installation. Zillions of reperfs!

https://militarymuseum.org/Resources/USASTRATCOMNo.3InteriorRelay.JPG

On Sat, Jan 18, 2025 at 2:10 PM Nick England <[email protected]> wrote:

I've acquired a couple of interesting early documents on the Army's FGC-30 tape relay center.
http://www.navy-radio.com/tty-relay.htm#army

One is a 1953 proposal to the Chief Signal Officer - it includes a photo of the experimental GGC-2 system installed at Fifth Army in Chicago
Another is a 1956 system description and includes photos of the FGC-30 prototype installed at Sixth Army in Davis.

Nick England K4NYW
www.navy-radio.com

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