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 |