All changes to tower
| Date | Change | Source |
|---|---|---|
| 4 May 2017 | 1-6: frameid added; frame info added | Bob Parker via e-mail |
| 5 Jan 2014 | 3: historically important | David Knight via e-mail |
| 19 Apr 2011 | 3: welded (1995) | David Sloman 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 |