All changes to tower
| Date | Change | Source |
|---|---|---|
| 30 Mar 2018 | 1-3: turning,frameid added; frame info added | Chris Pickford via 00012805 |
| 16 Mar 2012 | 1-3: nominal added | David Kelly via e-mail |
| 14 Mar 2005 | Tuning info added; tenor note not A | Tim Jackson#77 via e-mail |