All changes to tower
| Date | Change | Source |
|---|---|---|
| 21 Dec 2015 | 1: date amended | David Sloman via e-mail |
| 20 Dec 2015 | 1-6: turning added; 1-5: nominal added | Richard Offen via 00011453 |
| 28 Nov 2011 | 1-6: diam, canon info, frame id added; frame info added | John Baldwin via database |