| 340 / | HD | COMMUNICATIONS: ELECTRICAL |
| 825 | DF | SELECTIVE {23} |
| 825.79 | DF | .~ Matrix {4} |
| 825.85 | ![]() | .~.~ Semiconductor crosspoint {6} |
| 825.86 | DF | .~.~.~> Integrated circuit |
| 825.87 | DF | .~.~.~> Logic |
| 825.88 | DF | .~.~.~> Bistable |
| 825.89 | DF | .~.~.~> Switching element |
| 825.9 | DF | .~.~.~> Transistor {3} |
| 825.94 | DF | .~.~.~> Diodes {2} |