| 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} |
| 761 | DD | .~ For balance wheels [G04D 7/08] {2} |
| 763 | DD | .~.~ For balancing [G04D 7/08C] {3} |
| 767 | | .~.~.~ By loading the balance wheel itself with material [G04D 7/08C4] |