All changes to tower
| Date | Change | Source |
|---|---|---|
| 2 Jan 2017 | frame: date added | Philip Denton via e-mail |
| 8 Nov 2016 | 1-3: frameid,canon info added; frame info added | David Sloman via 00011835 |
| 17 Feb 2012 | 1: historically important | David Knight via e-mail |
| 11 Dec 2005 | Tenor nominal corrected (from 945.1Hz) | Tim Jackson#85 via e-mail |
| 18 Jul 2005 | Tenor nominal added (=Bb+17c) | David Kelly via e-mail |
| 25 Jan 2004 | URL changed | Gary J Sheppard: SDGR webmaster via e-mail |
| 8 Jan 2004 | URL added | Gary J Sheppard: SDGR webmaster via e-mail |