| 29 / | HD | METAL WORKING |
| 592 | DF | METHOD OF MECHANICAL MANUFACTURE {54} |
| 428 | DF | .~ Assembling or joining {21} |
| 525.01 | DF | .~.~ By applying separate fastener {5} |
| 525.13 | ![]() | .~.~.~ With supplemental joining {2} |
| 525.14 | DF | .~.~.~.~> Metal fusion joining |
| 525.15 | DF | .~.~.~.~> At least one part nonmetallic |