All changes to tower
| Date | Change | Source |
|---|---|---|
| 27 Dec 2021 | 1-3: nominal added | Recordings by Lucas J Bent (visited 2019). Analysed through Wavanal by Kye L Leaver |
| 27 Nov 2021 | 1-3: hanging type, frame number added. | L Bent, visited 2019 |
| 25 May 2020 | 1-3: details added | Theo Johnson via e-mail |