US PATENT SUBCLASS 968 / 100
.~ With constant impulses for the regulating mechanism (electrically driven pendulums with mechanical pulse transmission and constant pulse subclass 455; electrically driven pendulums with mechanical pulse transmission and constant pulse subclass 468) [G04B 15/10]

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968 /   HD   HOROLOGY

95  DD  ESCAPEMENTS (magnetic subclass 496; in striking mechanisms subclass 224;) [G04B 15/00] {5}
100.~ With constant impulses for the regulating mechanism (electrically driven pendulums with mechanical pulse transmission and constant pulse subclass 455; electrically driven pendulums with mechanical pulse transmission and constant pulse subclass 468) [G04B 15/10]