US PATENT SUBCLASS 968 / 855
.~ Using electrochemical means [G04F 13/04]
Current as of:
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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}
855
.~ Using electrochemical means [G04F 13/04]
