All changes to tower
| Date | Change | Source |
|---|---|---|
| 5 Dec 2014 | frame: precise date provided | Chris Pickford via e-mail |
| 15 Feb 2012 | 2-6: historically important (only 5 by these founders) | David Knight via e-mail |
| 8 Jan 2012 | 1-6: frame id added; frame info added | John Baldwin via database |
| 8 Nov 2004 | Tenor nominal added | Bill Hibbert via e-mail |