All changes to tower
| Date | Change | Source |
|---|---|---|
| 7 Apr 2018 | 1-8: partials added | David Kelly via e-mail |
| 14 Oct 2016 | frame: truss,layout added | Philip Denton via e-mail |
| 4 Aug 2010 | 1-8: frameid added; 1-7: canon info added; frame info added | John Baldwin via database |