All changes to tower
| Date | Change | Source |
|---|---|---|
| 17 Jun 2020 | 1-8: turning added; frame Fr1: date,truss,layout added | Tim Jackson via e-mail |
| 4 Dec 2015 | 1-8: frameid added; frame info added; Dis: added | John Baldwin via database |
| 5 May 2011 | 1-8: diam,nominal,canon info added | George Dawson via e-mail |