| 346 / | HD | RECORDERS |
| 45 | DF | PLURAL-FUNCTION RECORDER, DISTINGUISHABLE RECORDINGS {4} |
| 49 | DF | .~ Plural markers and single record receiver {1} |
| 50 | DF | .~.~ With dotting, printing, or punching marker {5} |
| 52 | DF | .~.~.~ Markers under selective control of element normally discrete from recorder {3} |
| 55 | ![]() | .~.~.~.~ Time-driven record receiver |