| 228 / | HD | METAL FUSION BONDING | 
| 101 | DF | PROCESS {38} | 
| 262.1 | DF | .~ Critical work component, temperature, or pressure {7} | 
| 262.4 | DF | .~.~ Ferrous metal member {2} | 
| 262.41 | DF | .~.~.~ Steel member {2} | 
| 262.42 | DF | .~.~.~.~ Brazing or soldering {1} | 
| 262.43 |  | .~.~.~.~.~ And nonferrous metal member |