US PATENT SUBCLASS 968 / 98
.~ Free escapements [G04B 15/06]

Current as of: June, 1999
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968 /   HD   HOROLOGY

95  DD  ESCAPEMENTS (magnetic subclass 496; in striking mechanisms subclass 224;) [G04B 15/00] {5}
98.~ Free escapements [G04B 15/06] {1}
99  DD  .~.~> Lever escapements [G04B 15/08]