360 / | HD | DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL |
69 | DF | AUTOMATIC CONTROL OF A RECORDER MECHANISM {3} |
75 | DF | .~ Controlling the head {3} |
78.01 | .~.~ Track changing {2} | |
78.02 | DF | .~.~.~> Tape {1} |
78.04 | DF | .~.~.~> For rotary carrier (e.g., disc) {8} |