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Re:Three typefaces for mathematics (2007) [pdf] by gerikson on Monday March 23, 2020 @03:50AM (#22661981)
Was Modern Series 7 compatible with the 4-line system? The thesis seems to imply the 4-line system and Times New Roman Series 569 were linked.

(page 13 compares hand-set Series 7 with 4-line set Series 569).

Re:Three typefaces for mathematics (2007) [pdf] by reikonomusha on Monday March 23, 2020 @11:19AM (#22664914)
That is a great question, and I might be misremembering that detail.