| 968 / | HD | HOROLOGY |
| 748 | DD | MEASURING, COUNTING, CALIBRATING, TESTING, OR REGULATING APPARATUS (measuring devices and calibers in general G01B; counters in general H03K) [G04D 7/00] {11} |
| 769 | DD | .~ Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard (supporting devices for clocks with built-in recording apparatus subclass 681; measuring short time intervals subclass 844; frequency measuring in general H04B, G01R) [G04D 7/12] {2} |
| 770 | DD | .~.~ Only for measuring [G04D 7/12B] {2} |
| 771 | DD | .~.~.~ For complete clockworks [G04D 7/12B2] {1} |
| 772 | DD | .~.~.~.~ With recording, e.g., vibrograph, etc. [G04D 7/12B2B] {1} |
| 773 | | .~.~.~.~.~ Devices for facilitating the reading or the interpretation of the recording [G04D 7/12B2B2] |