405 / | HD | HYDRAULIC AND EARTH ENGINEERING |
52 | DF | FLUID CONTROL, TREATMENT, OR CONTAINMENT {7} |
60 | DF | .~ Floatable matter containment {4} |
63 | DF | .~.~ Floating barrier {5} |
70 | .~.~.~ Having joint detail {1} | |
71 | DF | .~.~.~.~> Having hinged joint between rigid sections |