| 257 / | HD | ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES) |
| 565 | DF | BIPOLAR TRANSISTOR STRUCTURE {11} |
| 578 | DF | .~ With enlarged emitter area (e.g., power device) {4} |
| 582 | | .~.~ With current ballasting means (e.g., emitter ballasting resistors or base current ballasting resistors) |