| 307 / | HD | ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS |
| 401 | DF | NONLINEAR REACTOR SYSTEMS (E.G., SATURABLE) {11} |
| 407 | ![]() | .~ Logic circuits {4} |
| 408 | DF | .~.~> Multiaperture |
| 409 | DF | .~.~> Clocking, delay or transmission line |
| 410 | DF | .~.~> Nor, Not logic circuit |
| 411 | DF | .~.~> Exclusive Or, And logic circuit |