335 / | HD | ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS |
2 | DF | ELECTROMAGNETICALLY ACTUATED SWITCHES {30} |
106 | DF | .~ Multiple contact type {5} |
107 | DF | .~.~ Contacts-selectively, sequentially, alternately, or intermittently actuated {3} |
108 | DF | .~.~.~ Automatic telephone type {7} |
117 | .~.~.~.~ With operational mode-varying means |