| 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 | | .~ Wherein movement is regulated by a pendulum [G04C 3/02] {5} |
| 454 | DD | .~.~> Using mechanical coupling (using more than one pendulum subclass 457; using torsion pendulums subclass 464; using conical pendulums subclass 465) [G04C 3/02B] {1} |
| 456 | DD | .~.~> Using other coupling means, e.g., electrostrictive, magnetostrictive, etc.) [G04C 3/02D] |
| 457 | DD | .~.~> Using more than one pendulum (synchronization between master and slave pendulums subclass 532) [G04C 3/02K] |
| 458 | DD | .~.~> Using electromagnetic coupling between electric power source and pendulum (subclass 464 takes precedence) [G04C 3/027] {5} |
| 464 | DD | .~.~> Using torsion pendulums; using conical pendulums (construction thereof subclass 103) [G04C 3/033] {1} |