52 / | HD | STATIC STRUCTURES (E.G., BUILDINGS) |
720.1 | DF | SHAFT (I.E., ELONGATED RIGID STRUCTURE) {15} |
740.1 | DF | .~ Tension member (e.g., re-bar) {5} |
740.6 | DF | .~.~ Having projection which is one piece with shaft {1} |
740.7 | .~.~.~ Mechanically attached or bonded |