29 / | HD | METAL WORKING |
592 | DF | METHOD OF MECHANICAL MANUFACTURE {54} |
428 | DF | .~ Assembling or joining {21} |
429 | DF | .~.~ Progressively advancing of work assembly station or assembled portion of work {2} |
430 | .~.~.~ Advancing work to successive stations (i.e., assembly line) |