US PATENT SUBCLASS 968 / 856
.~ Using fluidic means [G04F 13/06]

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968 /   HD   HOROLOGY

851  DD  APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MEANS NOT PROVIDED FOR IN SUBCLASS 817 TO SUBCLASS 844 [G04F 13/00] {3}
856.~ Using fluidic means [G04F 13/06]