I may have been misleading about minimum speed.  I meant the minimum that someone would have aimed at in a high-school or secretarial course to become employable in business, not specifically at Teletype Corp. In my day boys were not trained to touch type, considered girls work.  Ugh.

I taught myself to touch type because I realized it's power for someone who likes to write.  I practice every day (except on this one finger thing).  Mostly on a mechanical machine to keep my hands strong.  Not many realized when I was in high school just how important basic computer skills would become.