re item 47 - underlining of superscript 'th' - if memory serves, I think that was really a the bottom edge of the key hitting the paper, not an actual part of the key face character. Too - because it hit high on the round roller, they tended to be lighter at the top - almost fading out as the paper curved away from the key face.
A 'ball' type typewriter, even if the ball had a superscript 'th' wouldn't have that underline, but I don't think it could raise the characters above the line - especially without that tell-tale fading towards the top.
Thank you--a most interesting addition. I must admit---most of this is "too Geek for me" stuff. But in this case it is relevant.
Here is my question:
Everyone now is investigating font types, IBM Selectrics from 1970, pixel frames, type space, etc. Especially CBS.
Did they give this extensive of an investigation into these things before they were questioned?