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 | .~.~.~ Scanning-panoramic receiver {1} | |
76.27 | DF | .~.~.~.~> With particular sweep circuit |