379 / | HD | TELEPHONIC COMMUNICATIONS |
350 | DF | SUPERVISORY OR CONTROL LINE SIGNALLING {5} |
352 | DF | .~ Substation originated {8} |
355 | .~.~ Repertory or abbreviated call signal generation {4} | |
356 | DF | .~.~.~> With dynamic memory |
357 | DF | .~.~.~> Insertable control element or circuitry (e.g., card) |
358 | DF | .~.~.~> By motor driven dial rotating device |
359 | DF | .~.~.~> Pulse signal generating (e.g., dialing) |