335 / | HD | ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS |
2 | DF | ELECTROMAGNETICALLY ACTUATED SWITCHES {30} |
87 | DF | .~ Periodic (e.g., vibrators) {6} |
88 | .~.~ Plural periodic switches or with plural pairs of contacts {1} | |
89 | DF | .~.~.~> Selectively, alternately, or consecutively actuated |