All changes to tower
| Date | Change | Source |
|---|---|---|
| 20 Feb 2020 | PN info added S | Neal Dodge via e-mail |
| 20 May 2017 | 1-6: turning,frameid added; 2-6: canons added; frame info added | Philip Denton via 00012161 |
| 30 Apr 2011 | 1-6: nominal added | Philip Denton via 00009286 |
| 16 Oct 2004 | Slight dedication change to match Crockford | Graham Nabb check via e-mail |