| 335 / | HD | ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS |
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| 209 | DF | MAGNETS AND ELECTROMAGNETS {10} |
| 220 |  | .~ With magneto-mechanical motive device (e.g., electromagnet with armature) {21} |
| 221 | DF | .~.~> Frequency-responsive type |
| 222 | DF | .~.~> With relatively movable coil and permanent magnet (e.g., D'Arsonval type) position on the cathode ray tube) |
| 223 | DF | .~.~> With relatively movable conductors (e.g., dynamometer) {1} |
| 227 | DF | .~.~> Saturable magnetic type |
| 228 | DF | .~.~> With motion-conversion means (e.g., reciprocating to rotary motion) |
| 229 | DF | .~.~> With permanent magnet {1} |
| 236 | DF | .~.~> With a shunt path for magnetic flux {1} |
| 238 | DF | .~.~> With auxiliary armature-movement control means (e.g., manual) |
| 239 | DF | .~.~> With time delay armature-movement control means {3} |
| 243 | DF | .~.~> Alternating current type {5} |
| 253 | DF | .~.~> With armature latch means (e.g., means to retain armature in open or closed position {1} |
| 255 | DF | .~.~> With plunger-type armature {6} |
| 265 | DF | .~.~> Plural armatures actuated by single electromagnetic coil |
| 266 | DF | .~.~> Plural coils or magnets control armature movement {2} |
| 269 | DF | .~.~> With dynamically balanced armature |
| 270 | DF | .~.~> Armature-mounting means {6} |
| 277 | DF | .~.~> With shock absorption, vibration or bounce-preventing means |
| 278 | DF | .~.~> With casing or enclosure |
| 279 | DF | .~.~> Armature shape, structure or material {1} |
| 281 | DF | .~.~> Core or pole shape, structure or material |
| 282 | DF | .~.~> Coil shape, structure or material |