| 337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
| 298 | DF | THERMALLY ACTUATED SWITCHES {7} |
| 306 | DF | .~ Expansible or vaporizable fluid actuated {12} |
| 307 | DF | .~.~ Plural expansible elements with single switch {1} |
| 308 | ![]() | .~.~.~ Individually responsive to diverse conditions or of diverse characteristics |