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 |