| 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 |