All changes to tower
| Date | Change | Source |
|---|---|---|
| 7 Nov 2016 | 1-6: frameid added; frame info added | John Baldwin via database |
| 26 Jan 2016 | PN info removed | Geoff Pullin (per J Ball, Branch Sec) via e-mail |
| 26 Oct 2011 | 1-5: nominal added; 1-6: canon info, turning added | Philip Denton via 00009741 |