US PATENT SUBCLASS 968 / 96
.~ Permanently in contact with the regulating mechanism [G04B 15/02]

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968 /   HD   HOROLOGY

95  DD  ESCAPEMENTS (magnetic subclass 496; in striking mechanisms subclass 224;) [G04B 15/00] {5}
96.~ Permanently in contact with the regulating mechanism [G04B 15/02] {1}
97  DD  .~.~> Cylinder escapements [G04B 15/04]