| 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} |
| 220 | DD | .~.~ With saw mechanism [G04B 21/02B] {1} |
| 221 | | .~.~.~ With silent saw action [G04B 21/02B2] |