| 968 / | HD | HOROLOGY |
| 446 | DD | ELECTROMECHANICAL CLOCKS OR WATCHES INDEPENDENT OF OTHER TIMEPIECES AND IN WHICH THE MOVEMENT IS MAINTAINED BY ELECTRIC MEANS (synchronization subclass 506) [G04C 3/00] {8} |
| 453 | DD | .~ Wherein movement is regulated by a pendulum [G04C 3/02] {5} |
| 464 | | .~.~ Using torsion pendulums; using conical pendulums (construction thereof subclass 103) [G04C 3/033] {1} |
| 465 | DD | .~.~.~> Using conical pendulums (construction thereof subclass 134) [G04C 3/033B] |