re: The CBS joke
"The th had an underline (th) and was the same height (on the same line) as the rest of the sentence. That is not the same as the documents in question."
It wasn't asserted that one typewriter had typed all the letters. Typewriters had options when ordering back then and they were not all the same.
I would like to see Dan's questions answered rather than be misdirected by some non-issue.