All changes to tower
| Date | Change | Source |
|---|---|---|
| 1 Aug 2020 | 1-6: turning added | [James Hedgcock] via 00013930 |
| 11 Apr 2018 | 1-6: frameid added; frame info added | John Baldwin via database |
| 2 Sep 2014 | 1-6: nominal added | Tim Jackson via 00010868 |
| 15 Jul 2012 | (W+P) URL added | Rosemary Oakeshott via e-mail |