 |
 |  | May 84 | X Window System 1 is released |
 |  | 85 | X Window System 9 is released |
 |  | | X Window System 10 is released
|
 |  | 85 | X Window System 9 is released
|
 |  | 85 | X Window System 10 is released
|
 |  | 15 Sep 87 | X Window System 11 is released |
 |  | Jan 88 | X Window System 11R2 is released |
 |  | Apr 04 | X Window System 11R6.7 is released |
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