379 / | HD | TELEPHONIC COMMUNICATIONS |
242 | DF | CENTRALIZED SWITCHING SYSTEM {15} |
258 | DF | .~ Switching controlled in response to called station addressing signal {9} |
268 | DF | .~.~ Having shared or common switching control {8} |
280 | DF | .~.~.~ Including registering or storing device for call address signal {7} |
284 | .~.~.~.~ With processor |