| 33 / | HD | GEOMETRICAL INSTRUMENTS |
| 300 | DF | INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23} |
| 365 | DF | .~ Level or plumb, terrestrial gravitation responsive {9} |
| 366.11 | DF | .~.~ Electrically actuated signal or indicator {9} |
| 366.15 | DF | .~.~.~ Fluent sensor {4} |
| 366.18 | ![]() | .~.~.~.~ Having fluent material reactive circuit control element (e.g., inductive) {1} |
| 366.19 | DF | .~.~.~.~.~> Capacitive sensor |