52 / | HD | STATIC STRUCTURES (E.G., BUILDINGS) |
720.1 | DF | SHAFT (I.E., ELONGATED RIGID STRUCTURE) {15} |
730.1 | DF | .~ Longitudinally related striplike sections {5} |
731.1 | DF | .~.~ Structural support {2} |
731.7 | DF | .~.~.~ Having angular component (e.g., having L, T, Z cross-section) {2} |
731.9 | .~.~.~.~ Partition support (e.g., stud, furring, etc.) |