| 324 / | HD | ELECTRICITY: MEASURING AND TESTING |
| 76.11 | DF | MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46} |
| 126 | ![]() | .~ With coupling means (e.g., attenuator, shunt) {2} |
| 127 | DF | .~.~> Transformer (e.g., split core admits conductor carrying unknown current) |
| 128 | DF | .~.~> Selective filter |