US PATENT SUBCLASS 968 / 801
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]

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968 /   HD   HOROLOGY

801APPARATUS 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}
802  DD  .~> Using electronic timing, e.g., counting means, etc. (pulse time delay arrangements H03K 5/13; modifications of electronic switches for introducing a time delay before switching H03K 17/28) [G04F 1/00B]
803  DD  .~> By consuming prefixed quantities of materials, e.g., by burning candle, etc. [G04F 1/02]
804  DD  .~> By movement or acceleration due to gravity [G04F 1/04] {2}