368 / | HD | HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES |
89 | DF | TIME INTERVAL {6} |
107 | DF | .~ Electrical or electromechanical {3} |
113 | DF | .~.~ Stop time type {5} |
115 | DF | .~.~.~ Including cathode-ray tube oscilloscope {2} |
117 | .~.~.~.~ With variable delay means |