405 / | HD | HYDRAULIC AND EARTH ENGINEERING |
258 | DF | EARTH TREATMENT OR CONTROL {5} |
263 | DF | .~ Chemical {2} |
266 | .~.~ Cementitious (e.g., grouting) {3} | |
267 | DF | .~.~.~> Filling substerranean cavity (e.g., underground wall) |
268 | DF | .~.~.~> Lining |
269 | DF | .~.~.~> Injector |