| 361 / | HD | ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES |
| 139 | DF | CONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICES {7} |
| 160 | DF | .~ For relays or solenoids {11} |
| 206 | ![]() | .~.~ Particular relay or solenoid {4} |
| 207 | DF | .~.~.~> Electrostatic |
| 208 | DF | .~.~.~> Polarized |
| 209 | DF | .~.~.~> Alternating current type |
| 210 | DF | .~.~.~> Plural coils |