| Digest Nr | Subject and Author |
|---|
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| 2026.03.17.03 | Kegg Recut Aeolian Duo Art Player Pipe Organ Rolls Wanted, from Don Taig |
| 2023.03.28.02 | Hardman Duo Valve History, from David Oppenheim |
| 2018.12.23.01 | Holiday Greetings From a Hardman Duo Art, from Ben Gottfried |
| 2015.06.15.07 | FS: Parts from 1955 Hardman Duo Player Piano, from James Williams |
| 2013.11.09.02 | Seek Sustain Pedal Pneumatic for Hardman Duo, from Tom Bodkin |
| 2013.09.07.09 | Electric Switch for 1970's " Duo Art" Player, from Gary Rasmussen |
| 2013.08.28.05 | Electric Switch for 1970's " Duo Art" Player, from Arthur Marino |
| 2013.08.06.07 | Electric Switch for 1970's " Duo Art" Player, from John A. Tuttle |
| 2013.08.05.11 | Electric Switch for 1970's " Duo Art" Player, from Jeff Davis |
| 2013.08.05.10 | Electric Switch for 1970's " Duo Art" Player, from David Dewey |
| 2013.08.04.10 | Electric Switch for 1970's " Duo Art" Player, from Dale F. Rowe |
| 2013.08.02.02 | Seek Electric Switch for 1970's " Duo Art" Player, from Gary Rasmussen |
| 2012.12.15.04 | FS: Hardman Duo in Huntingdon, Pennsylvania, from Jules Shaffer |
| 2012.07.12.01 | FS: Two Hardman " Duo" Player Pianos in Michigan, from Kel Geiger |
| 2007.12.06.09 | Rebuilding Hardman Duo Player Piano, from Bob Stewart |
| 2006.11.28.06 | FS: Hardman Duo 1958 Player Piano Parts, from James Williams |
| 2006.08.23.05 | FS Free: 1970's " Duo Art" 88-note Player Action, from David Winkelblech |
| 2006.08.14.04 | FS: 1958 Hardman Duo & Schultz Player Piano Parts, from James Williams |
| 2005.05.26.12 | Seek Ampico or Duo Art Upright Player Piano, from Frank Adams |
| 2004.01.06.08 | Hardman Duo Player Piano by Aeolian, from Arthur Marino |
| 2004.01.05.11 | Repairing Hardman Duo Player Piano, from Ellsworth Johnson |
| 2004.01.04.15 | FS: Hardman Duo Player Piano, from LS0420 |
| 2003.11.26.11 | FS: Aeolian Duo Arte Pianola in Queensland, from Diana Todd-Banks |
| 2003.08.11.09 | Repairing Valve in Hardman Duo Console Player, from Jeff Bridges |
| 2003.04.25.03 | FS: Schultz & Hardman Duo Player Actions, from James Williams |
| 2002.06.22.05 | Wanted: Duo ArtPipe Organ Console and Welte Pipe Organ Roll Player, from Howard Towlson |
| 2001.12.21.07 | FS: 1957 Hardman Duo 45" Console Player Piano, from Thomas Ahearn |
| 2001.11.17.07 | Current Production Duo Art Rolls, from Vincent Morgan |
| 2000.10.24.09 | FS: 1958 Hardman Duo Player Piano, from Thomas Ahearn |
| 2000.05.11.12 | Duo Art Expression Box, from Foster Cooper |
| 2000.05.07.03 | British Series Duo Art Rolls, from Alan Whytock |
| 2000.04.07.09 | FS: Five Duo Art Semi-Automatic Organ Rolls, from Les Kinney |
| 2000.02.14.07 | "Rhapsody in Blue" Duo Piano Performance, from Jurgen Goering |
| 2000.02.10.04 | My Mechanical Duo Heart, from Jonathan Holmes |
| 1999.09.22.09 | Duo Art Valves, from Brian Thornton |
| 1999.09.20.06 | Duo Art Valves, from Steve Greatrex |
| 1999.05.16.03 | Ampico Piano Duo Solos in "Ballet Mecanique", from Horst Mohr |
| 1999.04.21.08 | Adding a Sustain Pneumatic to Hardman Duo, from Bryan Cather |
| 1999.04.13.10 | Hardman Duo & Imperial Industrial Co., from Douglas Henderson |
| 1999.04.12.16 | Seek Hardman Duo Information, from Bryan Cather |
| 1999.03.30.04 | Hardman ' Duo' Player Action, from John A. Tuttle |
| 1999.03.29.05 | Seek Wind Motor Slide for Hardman Duo, from John McClure |
| 1998.12.24.03 | The Duo in the Duo-Art, from Douglas Henderson |
| 1998.10.14.10 | Duo Art Test Roll Ideas, from Bill Chapman |
| 1998.09.18.08 | Duo Art Transposing Tracker Bar, from Ed Hayden |
| 1998.05.29.12 | Weber 6' Grand Duo Art Pedal Only, from Nigel Perry |
| 1997.11.24.10 | Steck Duo Art, from Roger Waring |
| 1997.11.20.09 | Duo Art Cross Valve Measurements, from Craig Brougher |
| 1997.11.07.09 | Pedal - Electric Duo Art, from Phil Dayson |
| 1997.10.19.06 | Duo Art Even Playing, from D. L. Bullock |
| 1997.05.05.14 | Aeolian Duo Art Pipe Organ recordings, from Jack M. Conway |
| 1997.05.04.13 | AEolian Duo Art Pipe Organ recordings, from Bruce Clark |
| 1997.04.21.15 | Hardman Duo, from John A. Tuttle |
| 1997.04.20.10 | Repairing Hardman Duo, from Dave Fowler |
| 1997.04.05.11 | Hardman Duo Sustain, from Mark Van Essen |
| 1997.04.05.10 | Hardman Duo Sustain, from Don Teach |
| 1997.04.04.09 | Hardman Duo Sustain, from Bryan Cather |
| 1996.12.28.02 | Need Hardman Duo Repair Book, from Bryan Cather |
| 1996.12.08.05 | Hardman Duo, from Bryan Cather |
| 1996.11.24.02 | Re: Hardman Duo, from Bill Maxim |
| 1996.11.22.08 | Hardman Duo ?, from Bryan Cather |
| 1996.11.12.18 | Selling Duo Art Repro Rolls, from Michael Concordia |
| 1996.05.17.01 | For Sale: Steinway Duo Art, from Erik Siverson |
| 1996.05.10.05 | Re: Duo Art Rolls, from Bob Conant |
| 1996.02.20.08 | Help with 1927 Aeolian Duo Art 2m9r Pipe Organ, from Carl Dodrill |
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