29 / | HD | METAL WORKING |
592 | DF | METHOD OF MECHANICAL MANUFACTURE {54} |
890.12 | DF | .~ Valve or choke making {5} |
890.124 | .~.~ With assembly, disassembly or composite article making {3} | |
890.125 | DF | .~.~.~> Joining plural semi-circular components |
890.126 | DF | .~.~.~> With material shaping or cutting {4} |
890.131 | DF | .~.~.~> Including metallurgical bonding |