| Digest Nr | Subject and Author |
|---|
 |
| 2020.11.19.01 | Organ Clock by Coenraad Ludwig Leib at Waddesdon, from Kasper Janse |
| 2009.04.08.04 | Ludwig Wambold, Hupfeld Piano Roll Artist, from John Phillips |
| 2007.05.18.07 | Ludwig Industries Metal Stampings for Art Glass, from Walt Kehoe |
| 2007.05.17.10 | Ludwig Industries Metal Stampings for Art Glass, from Don Teach |
| 2001.12.10.06 | Ludwig Player Piano, from dave.capron@twcable.com |
| 2000.01.05.11 | Ludwig Perryola Player Piano, from Lou Kretchek |
| 1999.02.01.14 | Ludwig Accordion & Ludwig Hupfeld Pianos, from begrlg@swbell.net |
| 1999.02.01.14 | Ludwig Accordion & Ludwig Hupfeld Pianos, from begrlg@swbell.net |
| 1999.01.10.01 | Ludwig Hupfeld Company Today, from Hauke Marxsen |
| 1998.09.02.14 | Rolls & Player Pianos by Ludwig Hupfeld AG, from Dan Wilson, London |
| 1997.11.16.10 | Seek Ludwig Player Action, from Eric Bergstrom |
| 1997.09.11.11 | Ludwig Tracker System, from Eddie Fulmer |
| 1997.09.04.12 | Ludwig Player Action, from Dan Armstrong |
| 1997.06.13.13 | Ludwig Player Action, from Eddie Fulmer |
|
