US PATENT SUBCLASS 968 / 74
.~ Devices in which the motion of a rotating member is limited to one direction [G04B 11/00B]


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968 /   HD   HOROLOGY

73  DD  CLICK DEVICES; STOP CLICKS; CLUTCHES (mechanisms for winding up by hand subclass 23; automatic winding up subclass 40;) [G04B 11/00] {4}
74.~ Devices in which the motion of a rotating member is limited to one direction [G04B 11/00B] {3}
75  DD  .~.~> With a ratchet which makes contact with the rotating member by means of teeth [G04B 11/00B2] {1}
77  DD  .~.~> With clamping member [G04B 11/00B3]
78  DD  .~.~> With friction member, e.g., click spring, etc. [G04B 11/00B4]