US PATENT SUBCLASS 968 / 776
.~.~.~.~ For measuring frequency [G04D 7/12B3C]


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968 /   HD   HOROLOGY

748  DD  MEASURING, COUNTING, CALIBRATING, TESTING, OR REGULATING APPARATUS (measuring devices and calibers in general G01B; counters in general H03K) [G04D 7/00] {11}
769  DD  .~ Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard (supporting devices for clocks with built-in recording apparatus subclass 681; measuring short time intervals subclass 844; frequency measuring in general H04B, G01R) [G04D 7/12] {2}
770  DD  .~.~ Only for measuring [G04D 7/12B] {2}
774  DD  .~.~.~ For the control mechanism only found from outside the clockwork [G04D 7/12B3] {2}
776.~.~.~.~ For measuring frequency [G04D 7/12B3C]