| Digest Nr | Subject and Author |
 |
| 2014.01.23.09 | Disconnected Push-button Valve Near Roll Drive, from Tony Marsico |
| 2014.01.23.08 | Disconnected Push-button Valve Near Roll Drive, from Don Teach |
| 2014.01.21.06 | Disconnected Push-button Valve Near Roll Drive, from Scotty Greene |
| 2001.10.30.10 | Wurlitzer Electric Push-Button Switch, from Andrew Barrett |
| 2001.10.29.13 | Wurlitzer Electric Push-Button Switch, from Richard Schrader |
| 1998.07.30.11 | Push-Button Answers, from John Preble |
 |