US PATENT SUBCLASS 968 / 838
.~ Using continuously running driving means [G04F 8/00B]

Current as of: June, 1999
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968 /   HD   HOROLOGY

837  DD  APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY ELECTROMECHANICAL MEANS [G04F 8/00] {4}
838.~ Using continuously running driving means [G04F 8/00B]