| 324 / | HD | ELECTRICITY: MEASURING AND TESTING |
| 76.11 | DF | MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46} |
| 76.12 | DF | .~ Analysis of complex waves {3} |
| 76.19 | DF | .~.~ Frequency spectrum analyzer {7} |
| 76.26 | DF | .~.~.~ Scanning-panoramic receiver {1} |
| 76.27 | ![]() | .~.~.~.~ With particular sweep circuit |