| Digest Nr | Subject and Author |
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| 2008.06.05.04 | Half Duo-Art Mystery Pallet Valves, from Julian Dyer |
| 2008.06.04.04 | Half Duo-Art Mystery Pallet Valves, from Randolph Herr |
| 2008.06.03.02 | Pedal Duo-Art ( Half Duo-Art) Tubing Diagram, from John A. Tuttle |
| 2008.05.30.07 | Pedal Duo-Art ( Half Duo-Art) Tubing Diagram, from Julian Dyer |
| 2008.05.30.06 | Pedal Duo-Art ( Half Duo-Art) Tubing Diagram, from John A. Tuttle |
| 2008.05.29.03 | Pedal Duo-Art ( Half Duo-Art) Tubing Diagram, from John Phillips |
| 2008.05.28.04 | Pedal Duo-Art ( Half Duo-Art) Tubing Diagram, from John A. Tuttle |
| 2007.11.30.07 | FS: Stroud Foot-Pumped Half Duo-Art Upright, from Ed Gloeggler |
| 2007.11.02.10 | Soft Pedal Control in Half Duo-Art System, from John Phillips |
| 2007.10.03.12 | Steck Half Duo-Art Pianola, from Nigel Perry |
| 2007.10.03.11 | Steck Half Duo-Art Pianola, from Julian Dyer |
| 2007.10.02.06 | Steck Half Duo-Art Pianola, from Michael Woolf |
| 2007.10.02.05 | Steck Half Duo-Art Pianola, from David Haibach |
| 2007.10.02.04 | Steck Half Duo-Art Pianola, from Paul Morris |
| 2007.10.01.02 | Steck Half Duo-Art Pianola, from John Phillips |
| 2007.09.28.04 | Steck Half Duo-Art Pianola, from Andy Hood |
| 2006.06.18.09 | FS: Half Duo-Art Unit from George Steck Piano, from Tim Johnson |
| 2006.04.18.10 | Seek Half Gear for ArtEcho Tempo Governor, from D. L. Bullock |
| 2006.02.25.06 | FS: Weber ' Half Duo-Art' 1922 Grand, from Mark Fudge |
| 2005.04.11.06 | Half Duo-Art Pianola, from Arthur Marino |
| 2005.04.10.06 | Half Duo-Art Pianola, from Randolph Herr |
| 2005.04.10.05 | Half Duo-Art Pianola, from Spencer Chase |
| 2005.04.09.03 | Weber Half Duo-Art Pianola, from Jason Fisher |
| 2004.07.27.07 | Half Duo-Art Expression Box, from Stefan Essen |
| 2003.11.07.08 | FS: Half Duo-Art Stroud Upright, from Don Bryant |
| 2000.01.28.11 | Half Pedaling, from Andy Taylor |
| 1998.12.23.13 | Half Duo-Art In 1920 Steinway, from John Johns |
| 1998.08.26.16 | Half Duo-Art Player System, from Julian Dyer |
| 1998.08.26.15 | Half Duo-Art Player System, from Peter Coggins |
| 1998.08.25.15 | Half Duo-Art Player System, from Patrick Boeckstijns |
| 1998.06.01.15 | Weber Half Duo-Art, from Peter Coggins |
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