All changes to tower
| Date | Change | Source |
|---|---|---|
| 26 Aug 2019 | 2: canon info added | Tim Jackson via e-mail |
| 16 Aug 2019 | 1-8: nominal,frameid added; 1,3,4,6,7: diam amended; | Chris Pickford via 00013544 |
| 7: date amended; 1: canon info added; frame info added | Chris Pickford via 00013544 |