361 / | HD | ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES |
600 | DF | HOUSING OR MOUNTING ASSEMBLIES WITH DIVERSE ELECTRICAL COMPONENTS {11} |
679 | DF | .~ For electronic systems and devices {15} |
748 | DF | .~.~ Printed circuit board {4} |
749 | .~.~.~ Flexible board {2} | |
750 | DF | .~.~.~.~> With specific dielectric material or layer |
751 | DF | .~.~.~.~> With particular conductive material or coating |