All changes to tower
| Date | Change | Source |
|---|---|---|
| 12 Apr 2020 | 1-4: frameid added; 1: canon info added; fr1: details added | Tim Jackson via e-mail |
| 15 Jun 2009 | 1-4: nominal added | Nick Bowden via 00007591 |
| 30 May 2009 | 2,3,4: diam added | Chris Pickford via 00007510 |
| 29 May 2009 | 2: founder amended | George Dawson via e-mail |
| 25 Nov 2003 | Tenor note not F | Tim Jackson #52 via e-mail |