| 337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
| 298 | DF | THERMALLY ACTUATED SWITCHES {7} |
| 306 | DF | .~ Expansible or vaporizable fluid actuated {12} |
| 309 | DF | .~.~ Multiple contacts or external circuit completion means {2} |
| 310 | ![]() | .~.~.~ Plural independent switches |