| Digest Nr | Subject and Author |
|---|
 |
| 2021.03.12.10 | FS: Harper Electric & Kuhl & Klatt 73-note Rolls, from Paul Baker |
| 2020.10.18.01 | Seek Harper Electric Piano Sold in 2004 Auction, from Paul Baker |
| 2020.05.01.02 | Harper Electric Piano Restoration, from David Evans |
| 2007.02.25.01 | Harper Electric Piano Co., Ltd., of London, from Paul Camps |
| 2007.02.23.05 | Harper Electric Piano Co., Ltd., of London, from David Evans |
| 2007.02.22.02 | Harper Electric Piano Co., Ltd., of London, from Neal Anderson |
| 2006.04.02.03 | Harper Electric Piano "Pneuma" & "Reliance" Rolls, from Paul Camps |
| 2006.04.01.04 | Harper Electric Piano & "Original Pneuma" Rolls, from Julian Dyer |
| 2003.06.30.08 | Harper Electric Piano Rolls, from Julian Dyer |
| 2003.06.30.07 | Harper Electric Piano at Ashorne Hall, from Paul Camps |
| 2003.06.29.05 | FS: Harper Electric Piano Co. Rolls 34 cm Wide, from Brian Chesters |
|
