All changes to tower
| Date | Change | Source |
|---|---|---|
| 24 Jun 2017 | 1-6: canons,frameid added; frame info added | Tim Jackson via 00012252 |
| 28 May 2015 | 1-6: nominal added; 2,3,4,6: diam amended | Tim Jackson via 00011178 |
| 16 Jun 2008 | PN is Tue not Wed | Jo Elliott via e-mail |