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} |
688 | DF | .~.~ With cooling means {2} |
704 | DF | .~.~.~ Thermal conduction {8} |
720 | DF | .~.~.~.~ For printed circuit board {1} |
721 | .~.~.~.~.~ Plural |