| 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} |
| 568.6 | | .~.~.~ Sporting equipment (e.g., golfbag, club, cart, or skis) |