Some of the details on the right side of the chart are a little bit scrambled...
1988: Compugraphic was acquired by Agfa Gaevert and rebranded as Agfa.
1999: Monotype Typography was acquired by Agfa and rebranded as Agfa Monotype.
2000: ITC (including the Letraset faces) was acquired by Agfa Monotype from Esselta Letraset. (Esselta had acquired Letraset in the early 1980s, and then ITC in 1986.)
2004: Agfa Monotype was acquired by TA Associates and rebranded as Monotype Imaging.
Finally, as a minor point, there should be an arrow going from (Agfa) Monotype to Ascender Fonts, which split off from Monotype in 2004.
Some of the details on the right side of the chart are a little bit scrambled...
You're right, I treated the time before Agfa-Monotype very generally (even though these were important events in the history of typography). In my opinion it made the picture too complicated. I have also stopped including the names of many important typefaces...
The scale of the Empire exceeded my capabilities, but I think the chart reflects the market situation
Comments
1988: Compugraphic was acquired by Agfa Gaevert and rebranded as Agfa.
1999: Monotype Typography was acquired by Agfa and rebranded as Agfa Monotype.
2000: ITC (including the Letraset faces) was acquired by Agfa Monotype from Esselta Letraset. (Esselta had acquired Letraset in the early 1980s, and then ITC in 1986.)
2004: Agfa Monotype was acquired by TA Associates and rebranded as Monotype Imaging.