| 968 / | HD | HOROLOGY |
| 217 | DD | INDICATING BY ACOUSTIC MEANS (at preselected times subclass 229; by electroacoustic means or electroacoustic time indicating subclass 582; time indicating by means other than acoustically, or combined means subclass 243; time indicating by visual means subclass 139; acoustic signalling arrangements G08B 3/00) [G04B 21/00] {2} |
| 219 | DD | .~ Regular striking mechanisms giving the full hour, half hour, or quarter hour [G04B 21/02] {8} |
| 226 | | .~.~ Releasing or locking the regular stroke, e.g., for silence during the night, etc. [G04B 21/10] |