| 431 / | HD | COMBUSTION |
| 129 | DF | BURNER HEAD COVER OPERATIVELY INTERRELATED WITH IGNITER {8} |
| 138 | DF | .~ Common axis for cover and abrasive wheel {1} |
| 139 | ![]() | .~.~ Actuator (e.g., finger piece) engaged with cover for relative movement {1} |
| 140 | DF | .~.~.~> Gear drive between cover and actuator |