Could your typewriter type superscripts?
I googled:
"Although IBM had produced a successful typebar-based machine, the IBM Executive, with proportional spacing, no proportionally-spaced Selectric office typewriter was ever introduced."
http://www.all-science-fair-projects.com/science_fair_projects_encyclopedia/Typewriter
"My favorite electric typewriter was the IBM Executive, of which I have owned two in my lifetime. The first had a proportional font called "Mid Century" that looked like 12 point Futura Medium, and the characters were anywhere from 1 unit wide (lower case i) to 5 units or more (cap M).
It produced beautiful letters long before there was any such thing as word processing, and corrections were a real bitch cause I had to remember how wide each character was when I was backspacing."
http://www.techwr-l.com/techwhirl/archives/9505/techwhirl-9505-01222.html
Yep, I remember the backspacing problems. They were a real problem.
blessings, Bobo
Even in the 60's, we could do superscripts. You just twisted the roller back 1/2 line and typed the superscripted stuff and then rolled forward 1/2 line to continue.
If you had a cheap typewriter like mine, you never quite got back to the same line.