340 / | HD | COMMUNICATIONS: ELECTRICAL |
500 | DF | CONDITION RESPONSIVE INDICATING SYSTEM {6} |
540 | DF | .~ Specific condition {18} |
568.1 | DF | .~.~ Article placement or removal (e.g., anti-theft) {9} |
568.8 | ![]() | .~.~.~ Article on pedestal, in display case, or mounted on wall (e.g., work of art) |