| 968 / | HD | HOROLOGY |
|
| 524 | DD | DRIVING MECHANISMS FOR CLOCKS BY MASTER CLOCKS [G04C 13/00] {2} |
| 547 |  | .~ Slave clocks actuated intermittently [G04C 13/08] {3} |
| 548 | DD | .~.~> By electromechanical step-advancing mechanisms (independent clocks or watches incorporating a stepping motor subclass 490; stepping motors in general H02K 33/00) [G04C 13/10] {2} |
| 551 | DD | .~.~> By continuously rotating electric motors (independent clocks subclass 493; clocks driven by synchronous motors subclass 553) [G04C 13/12] |
| 552 | DD | .~.~> By electrically released mechanical driving mechanisms [G04C 13/14] |