All changes to tower
| Date | Change | Source |
|---|---|---|
| 17 Jun 2020 | 1-3: turning added | Tim Jackson via e-mail |
| 18 Oct 2018 | frame: layout added | Mike Chester via e-mail |
| 22 Dec 2013 | 1-3: frameid added; frame info added | Philip Denton via e-mail |
| 2 Dec 2009 | Mon PN info added | Ray Fanthorpe, Guild Report Editor via e-mail |
| 5 Oct 2004 | Tenor nominal added | David Kelly via e-mail |