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 |