All changes to tower
| Date | Change | Source |
|---|---|---|
| 6 May 2019 | fr1: info added; Svc: info added; all: frameid added | John Baldwin via database |
| 24 Apr 2009 | 1-8: canon info added; 1-7: nominal added; 8: nominal amended | Andrew Higson via 00007355 |
| 24 Dec 2006 | Tenor nominal added (F#-19c) | Andrew Higson via pNBR |