US PATENT SUBCLASS 968 / 851
APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MEANS NOT PROVIDED FOR IN SUBCLASS 817 TO SUBCLASS 844 [G04F 13/00]

Current as of: June, 1999
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968 /   HD   HOROLOGY

851APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MEANS NOT PROVIDED FOR IN SUBCLASS 817 TO SUBCLASS 844 [G04F 13/00] {3}
852  DD  .~> Using optical means [G04F 13/02] {2}
855  DD  .~> Using electrochemical means [G04F 13/04]
856  DD  .~> Using fluidic means [G04F 13/06]