All changes to tower
| Date | Change | Source |
|---|---|---|
| 19 Feb 2020 | PN info added S | Ben Kipling via e-mail |
| 13 Jul 2009 | 1-12: canon & turning info added; 1-11: nominal added; | Andrew Higson via 00007783 |
| 6,9,11: diam amended; frame info added | Andrew Higson via 00007783 | |
| 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 |