360 / | HD | DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL |
69 | DF | AUTOMATIC CONTROL OF A RECORDER MECHANISM {3} |
75 | DF | .~ Controlling the head {3} |
77.01 | .~.~ Track centering {2} | |
77.02 | DF | .~.~.~> Rotary carrier {5} |
77.12 | DF | .~.~.~> Elongated web carrier (i.e., tape) {1} |