@SteveBellovin Jealous. It's like I'm resurrecting these technologies, because I'm not learning them from school or a colleague, as they're long obsolete. Digging through manuals and reverse engineering is fun, but not quite the same.

Where were these Model 37s?? I've been desperately trying to track one down. They're exceedingly rare and I'll follow any lead.

The Terminals Wiki has photos of the Silent 700 models. I'd group them into 743/745, 703/707, 732/733/742 ASR, 732/733/742 KSR, and 725, if you only remember how they looked.
https://terminals-wiki.org/wiki/index.php?search=ti+silent+700&title=Special%3ASearch&go=Go

At a glance, those papers look interesting. I'll give them a read.