| Digest Nr | Subject and Author |
|---|
 |
| 2020.10.30.01 | Early T-100 Welte-Mignon Dual Sustain Pedal Speeds, from Jim Miller |
| 2020.10.23.03 | Early T-100 Welte-Mignon Dual Sustain Pedal Speeds, from Jim Miller |
| 2011.04.25.02 | Dual Role Piano Plays Duo-Art & Welte Rolls, from Dave Geissinger |
| 2000.03.14.07 | Dual Reproducers for Edison Phonograph, from John Kadlec |
| 2000.03.14.05 | Dual Reproducers for Phonographs, from Mike Knudsen |
| 2000.03.13.13 | Dual Reproducer for Edison Phonograph, from Jim Canavan |
| 2000.03.13.12 | Dual Reproducer for Edison Cylinder Phonograph, from Jim Moore |
| 2000.03.12.06 | Dual Reproducer for Edison Phonograph, from Martin Anderson |
| 1999.06.09.02 | Identify Dual Spoolbox Unit, from Dick Beery |
| 1998.05.06.13 | Steinway Welte With Dual Spoolbox, from Dave Saul |
| 1998.04.01.19 | Craig Brougher's Dual Pouch Regulator, from Peter Coggins |
| 1998.03.25.11 | Kilgen " Dual Control" Pipe Organ Player, from Marc Kaufman |
| 1997.11.05.15 | Dual Roll Player for Organ, from D. L. Bullock |
| 1997.11.03.08 | Dual Roll Player for Organ, from Dick Beery |
| 1995.12.28.02 | Dual Disk Porter Music Boxes, from Jack Hardman |
| 1995.12.28.01 | Dual Disk Porter Music Boxes, from Bob Ebert |
|
