US PATENT SUBCLASS 968 / 813
.~.~ Using electrical contacts, e.g., for actuating electro-acoustic device, etc. [G04F 3/02D]


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968 /   HD   HOROLOGY

809  DD  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] {2}
810  DD  .~ With mechanical driving mechanisms [G04F 3/02] {4}
813.~.~ Using electrical contacts, e.g., for actuating electro-acoustic device, etc. [G04F 3/02D]