There were no typewriters with the small th that I have used until I used a word processing program for the first time. I have a selectric typewriter and a Panasonic self correcting Executive typewriter that I just went and checked -- in a box and neither has a "th" on them.
Only typewriters I saw in 13 years with the Air Force were selectric or Executive typewriters. Standard issue was selectric from IBM. Both the ones I have are old and bought out a DMRO auction.
Wow, See BS is more biased and shameless than any of us imagined.
Actually, with some of those IBMs you could get a special character ball to use for things like superscripts. They were, however, expensive, breakable, hard to align, and very hard to use with any efficiency throughout a document. If you only needed one superscript on a page, it could be ok. But more than one and the alignment was invariably off. How do I know? I spent many hours and acquired a very interesting vocabulary attempting to create the crisp, professional documents I was after. 8->