US PATENT SUBCLASS 968 / 835
.~.~ Watches or clocks with stop devices, e.g., chronograph, etc. [G04F 7/08]

Current as of: June, 1999
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968 /   HD   HOROLOGY

831  DD  APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MECHANICAL MEANS [G04F 7/00] {3}
833  DD  .~ Using a mechanical oscillator [G04F 7/04] {2}
835.~.~ Watches or clocks with stop devices, e.g., chronograph, etc. [G04F 7/08]