| 405 / | HD | HYDRAULIC AND EARTH ENGINEERING |
| 258 | DF | EARTH TREATMENT OR CONTROL {5} |
| 272 | DF | .~ Shoring, bracing, or cave-in prevention {6} |
| 274 | DF | .~.~ Sheet piles {2} |
| 276 | | .~.~.~ Metal {5} |
| 277 | DF | .~.~.~.~> C or I sections |
| 278 | DF | .~.~.~.~> Head and claw interlock |
| 279 | DF | .~.~.~.~> With separate fastening, reinforcing or sealing means |
| 280 | DF | .~.~.~.~> Cellular |
| 281 | DF | .~.~.~.~> Bulb and socket interlock |