29 / | HD | METAL WORKING |
592 | DF | METHOD OF MECHANICAL MANUFACTURE {54} |
592.1 | DF | .~ Electrical device making {14} |
825 | DF | .~.~ Conductor or circuit manufacturing {8} |
829 | DF | .~.~.~ On flat or curved insulated base, e.g., printed circuit, etc. {5} |
830 | .~.~.~.~ Assembling bases |