| Digest Nr | Subject and Author |
|---|
 |
| 2024.08.16.02 | List of Laser Piano Roll Custom Cutting Firms, from Ben Roth |
| 2020.06.22.03 | Crank-organ Firms Building New Instruments, from Rob Barker |
| 2020.06.22.02 | Crank-organ Firms Building New Instruments, from Gordie Davidson |
| 2020.06.20.01 | Crank-organ Firms Building New Instruments, from Uwe Gernert |
| 2014.09.12.02 | Music Roll Perforating Firms, from Matthew Caulfield |
| 2010.04.04.04 | Music Roll Copying Firms, from Randolph Herr |
| 2003.07.30.01 | Bird Box Repair Firms, from Matthew Caulfield |
| 2002.04.28.04 | Music Roll Perforating Firms, from Ellsworth Johnson |
| 2002.04.27.04 | Music Roll Perforating Firms, from Ken Vinen |
| 2002.04.25.07 | Music Roll Perforating Firms, from Dan Wilson, London |
| 2002.04.20.03 | Music Roll Perforating Firms, from Ed Schmidt |
| 2002.04.19.01 | Music Roll Perforating Firms, from Don Teach |
| 2002.04.18.04 | Music Roll Perforating Firms, from Jon Miller |
| 2000.10.26.02 | Phonograph Repair Firms & Parts Sources, from Jack M. Conway |
| 2000.04.03.01 | The Two Gebroeders Decap Firms of Belgium, from Tony Decap |
| 1999.04.12.13 | Seek Piano Supply Firms in Australia, from Bernt Damm |
| 1999.02.21.01 | The Many Bruder Organ Firms of Waldkirch, from Bob Conant |
|
