All changes to tower
| Date | Change | Source |
|---|---|---|
| 1 Apr 2017 | 1-6: nominal added | David Kelly via e-mail |
| 3 Jan 2012 | 5: founder amended; 1-6: frameid added; frame info added | John Baldwin via database |
| 21 Oct 2009 | 1,5: canon info added | [George Massey] via e-mail |
| 12 Oct 2004 | Slight dedication change to match Crockford | Graham Nabb check via e-mail |