52 / | HD | STATIC STRUCTURES (E.G., BUILDINGS) |
415 | DF | FACERS; E.G., MODULES, MUTUALLY BONDED BY INTERNAL SETTABLE MATERIAL SECTION {13} |
424 | DF | .~ Laterally related modules; e.g., back-to-back {6} |
425 | DF | .~.~ Continuous section filling space between modules {1} |
426 | .~.~.~ With transverse tie |