| 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 |