| 315 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS |
| 312 | DF | PLURAL LOAD DEVICE SYSTEMS {3} |
| 313 | ![]() | .~ Electric switch in the supply circuit {5} |
| 314 | DF | .~.~> Pre-selectable switching systems {1} |
| 316 | DF | .~.~> Keyboard or pattern controlled switch |
| 317 | DF | .~.~> Three or more controlled load device circuits {1} |
| 320 | DF | .~.~> Plural switches {1} |
| 322 | DF | .~.~> Alternate circuit closing |