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 | DF | .~.~ Track centering {2} |
77.12 | .~.~.~ Elongated web carrier (i.e., tape) {1} | |
77.13 | DF | .~.~.~.~> Transverse scan path {2} |