360 / | HD | DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL |
69 | DF | AUTOMATIC CONTROL OF A RECORDER MECHANISM {3} |
71 | DF | .~ Controlling the record {3} |
73.01 | DF | .~.~ Speed {3} |
73.04 | .~.~.~ Linear carrier {2} | |
73.05 | DF | .~.~.~.~> Plural speed transport {3} |
73.09 | DF | .~.~.~.~> Constant speed {3} |