US PATENT SUBCLASS 968 / 89
.~ Where a revolution in both directions is changed into a revolution in one direction [G04B 13/00D]

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968 /   HD   HOROLOGY

85  DD  GEARWORK (Gearwork for driving the hands subclass 140; calibers subclass 284; dispositions and components for transmission in general F16H) [G04B 13/00] {5}
89.~ Where a revolution in both directions is changed into a revolution in one direction [G04B 13/00D] {1}
90  DD  .~.~> With two free wheel positions [G04B 13/00D2]