| 968 / | HD | HOROLOGY |
| 605 | DD | CLOCKS WITH ATTACHED OR BUILT-IN MEANS OPERATING ANY DEVICE AT PRESELECTED TIMES OR AFTER PRESELECTED TIME INTERVALS (if restricted to producing acoustic time signals by electrical means subclass 580; mechanical alarm clocks subclass 231; apparatus which can be set and started to measure off predetermined intervals subclass 815; time or time-program switches which automatically terminate their operation after the program is completed H01H 43/00) [G04C 23/00] {3} |
| 627 | DD | .~ Mechanisms measuring a chosen time interval independently of the time of day at which interval starts [G04C 23/38] {4} |
| 629 | DD | .~.~ Acting only at the end of a single time interval [G04C 23/42] {2} |
| 631 | | .~.~.~ With provision for adjustment of the interval (subclass 630 takes precedence) [G04C 23/46] |