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 |