| Digest Nr | Subject and Author |
|---|
 |
| 2019.05.16.06 | FS Free: PPCo Simplex Unit Pneumatic Tester, from Ed Chaban |
| 2014.04.16.02 | The "Buzzer" Valve Tester, from John A. Tuttle |
| 2008.01.13.09 | Player Piano Company's Simplex Valve Tester, from Andy Taylor |
| 2008.01.12.05 | Player Piano Company's Simplex Valve Tester, from Duaine Hechler |
| 1999.03.15.12 | New Valve Tester and Ampico B Valves, from Craig Brougher |
| 1999.03.14.09 | New Valve Tester & Ampico B Valves, from Craig Brougher |
| 1999.03.13.09 | Pneumatic Valve Tester Uses Tiny Loudspeaker, from Craig Brougher |
| 1997.03.08.07 | Kelly Tester, from Bob Conant |
| 1997.03.06.07 | "Kelly Tester" Test Roll, from Wayne Stahnke |
|
