52 / | HD | STATIC STRUCTURES (E.G., BUILDINGS) |
561 | DF | LATERALLY RELATED, INDIVIDUALLY ASSEMBLED COURSES {4} |
569 | .~ Opposed lateral monolithic projections on modules {2} | |
570 | DF | .~.~> Locking type; i.e., against lateral separation {1} |
572 | DF | .~.~> Opposed projections abutting |