315 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS |
209 R | DF | PERIODIC SWITCH IN THE SUPPLY CIRCUIT {11} |
210 | DF | .~ Plural load device systems {2} |
211 | DF | .~.~ Distributor type periodic switch means {3} |
212 | .~.~.~ Transformer in the supply circuit {2} | |
213 | DF | .~.~.~.~> Distributor switch means in the primary circuits of plural transformers |
214 | DF | .~.~.~.~> With additional periodic switch in the primary circuit |