US PATENT SUBCLASS 968 / 809
APPARATUS WHICH CAN BE SET AND STARTED TO MEASURE OFF PREDETERMINED OR ADJUSTABLY FIXED TIME INTERVALS WITH DRIVING MECHANISMS, E.G., DOSIMETER WITH CLOCKWORK, ETC. (electric time or time-program switches H01H 43/00) [G04F 3/00]

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968 /   HD   HOROLOGY

809APPARATUS WHICH CAN BE SET AND STARTED TO MEASURE OFF PREDETERMINED OR ADJUSTABLY FIXED TIME INTERVALS WITH DRIVING MECHANISMS, E.G., DOSIMETER WITH CLOCKWORK, ETC. (electric time or time-program switches H01H 43/00) [G04F 3/00] {2}
810  DD  .~> With mechanical driving mechanisms [G04F 3/02] {4}
815  DD  .~> With electric driving mechanisms [G04F 3/06] {1}