| 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} |
| 223 | | .~.~ Hour wheels; racks or rakes; snails or similar control mechanisms [G04B 21/04] |