US PATENT SUBCLASS 968 / 104
.~ Regulating mechanisms where the movement is maintained by pneumatic means (oscillation generation by pneumatic means subclass 828) [G04B 17/00B]

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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}
104.~ Regulating mechanisms where the movement is maintained by pneumatic means (oscillation generation by pneumatic means subclass 828) [G04B 17/00B]