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 |