360 / | HD | DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL |
69 | DF | AUTOMATIC CONTROL OF A RECORDER MECHANISM {3} |
71 | DF | .~ Controlling the record {3} |
72.1 | .~.~ Locating specific areas {2} | |
72.2 | DF | .~.~.~> Responsive to recorded address |
72.3 | DF | .~.~.~> Responsive to tape transport |