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 | | .~.~.~ Including registering or storing device for call address signal {7} |
281 | DF | .~.~.~.~> Conversion between dial pulse and voice frequency signal |
282 | DF | .~.~.~.~> Voice frequency receiver {1} |
284 | DF | .~.~.~.~> With processor |
285 | DF | .~.~.~.~> With magnetic memory |
286 | DF | .~.~.~.~> Signal processing (e.g., dial pulse analysis) |
287 | DF | .~.~.~.~> Electronic |
288 | DF | .~.~.~.~> Register-sender |