| Digest Nr | Subject and Author |
|---|
 |
| 2023.05.28.01 |
Seek Hupfeld Helios Rolls or MIDI Files, from Ron Schmuck |
| 2012.03.15.06 |
FS: Hupfeld Helios, Triphonola & Welte Organ Rolls, from Klaus Peuler |
| 2010.10.25.04 |
Seek Hupfeld Helios Rolls, from Dave Bowers |
| 2010.07.30.05 |
FS: Hupfeld Helios & Welte Cottage Rolls, from Klaus Peuler |
| 2010.01.08.04 |
Seek Image of Hupfeld Helios Roll Label, from Niels Berkers |
| 2009.05.27.04 |
Seek Hupfeld Helios & Clavitist-Universal Scales, from Niels Berkers |
| 2009.05.11.05 |
History of Hupfeld Helios Orchestrion, from Brian Smith |
| 2000.08.04.12 |
FS: Hupfeld Helios Tracker Bar, from Brian Thornton |
| 2000.07.29.08 |
FS: Hupfeld Helios Tracker Bar, from Brian Thornton |
| 1999.06.10.11 |
FS: Hupfeld Helios, from Bill and Dee Kavouras |
| 1998.03.24.11 |
Hupfeld Helios Soft Swell Control System, from Brian Thornton |
|
