I'd love to see the docs on that early stuff and
see if Joe Ossanna
added in his own magic or was he carrying forward earlier magic.
Here are scans of non-unix roff in 1971: https://www.cs.dartmouth.edu/~doug/roff71/roff71
I also have 1969, but it's bedtime and that will have to wait.
Relative numbers (+n), roman numerals, .ti, top and bottom margin settings,
.po, running titles, tab settings, hyphenation and footnotes were not in
Saltzer's runoff. Most other features were.