323 / | HD | ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS |
220 | IN SHUNT WITH SOURCE OR LOAD {7} | |
221 | DF | .~> Photo responsive |
222 | DF | .~> Using choke and switch across source |
223 | DF | .~> Using a three or more terminal semiconductive device {3} |
227 | DF | .~> Using electronic tube {1} |
229 | DF | .~> Using diode {2} |
232 | DF | .~> Using inductor |
233 | DF | .~> Using impedance |