337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
298 | DF | THERMALLY ACTUATED SWITCHES {7} |
333 | DF | .~ With bimetallic element {9} |
334 | DF | .~.~ With manual or other mechanical contact control means {10} |
335 | DF | .~.~.~ Plural elements combined with single mechanical means {1} |
336 | .~.~.~.~ Individually responsive to diverse conditions or of diverse operating characteristics |