335 / | HD | ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS |
209 | DF | MAGNETS AND ELECTROMAGNETS {10} |
220 | DF | .~ With magneto-mechanical motive device (e.g., electromagnet with armature) {21} |
238 | .~.~ With auxiliary armature-movement control means (e.g., manual) |