| 968 / | HD | HOROLOGY |
| 801 | DD | APPARATUS WHICH CAN BE SET AND STARTED TO MEASURE OFF PREDETERMINED OR ADJUSTABLY FIXED TIME INTERVALS WITHOUT DRIVING MECHANISMS, E.G., EGG TIMER, ETC. (electric time and time-program switches H01H 43/00) [G04F 1/00] {3} |
| 804 | DD | .~ By movement or acceleration due to gravity [G04F 1/04] {2} |
| 808 | | .~.~ By a body falling a prefixed distance in air or in a viscous material [G04F 1/08] |