337 / | HD | ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES |
14 | DF | ELECTROTHERMALLY ACTUATED SWITCHES {9} |
22 | DF | .~ Fluorescent lamp-starting devices {3} |
26 | DF | .~.~ With significant contact structure or composition {1} |
27 | .~.~.~ Bimetallic element |