29 / | HD | METAL WORKING |
592 | DF | METHOD OF MECHANICAL MANUFACTURE {54} |
592.1 | DF | .~ Electrical device making {14} |
602.1 | DF | .~.~ Electromagnet, transformer or inductor {6} |
607 | DF | .~.~.~ Including permanent magnet or core {2} |
608 | .~.~.~.~ From comminuted material |