US PATENT SUBCLASS 968 / 134
.~ Rotating governors, e.g., centrifugal governors, fan governors, etc. (for striking mechanisms subclass 224; electrically driven subclass 465) [G04B 17/30]

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968 /   HD   HOROLOGY

103  DD  MECHANISMS FOR STABILIZING FREQUENCY (magnetic subclass 497; in striking mechanisms subclass 224; stopping and regulating of the running subclass 234; electrical and thermoelectric regulating mechanisms subclass 496) [G04B 17/00] {8}
134.~ Rotating governors, e.g., centrifugal governors, fan governors, etc. (for striking mechanisms subclass 224; electrically driven subclass 465) [G04B 17/30]