All changes to tower
| Date | Change | Source |
|---|---|---|
| 4 Jul 2020 | fr1: layout added | Chris Pickford via e-mail |
| 16 Jun 2020 | 1-8: turning,frameid added; fr1: details added | Chris Pickford via 00013829 |
| 1 May 2009 | 1-8: nominal,canon info added; 1,2,8: diam amended | Andrew Higson via 00007401 |