US PATENT SUBCLASS 968 / 462
.~.~.~ The pendulum controlling indirectly, i.e., without mechanical connection, contacts, e.g., by magnetic or optic means, etc. [G04C 3/027E]


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968 /   HD   HOROLOGY

446  DD  ELECTROMECHANICAL CLOCKS OR WATCHES INDEPENDENT OF OTHER TIMEPIECES AND IN WHICH THE MOVEMENT IS MAINTAINED BY ELECTRIC MEANS (synchronization subclass 506) [G04C 3/00] {8}
453  DD  .~ Wherein movement is regulated by a pendulum [G04C 3/02] {5}
458  DD  .~.~ Using electromagnetic coupling between electric power source and pendulum (subclass 464 takes precedence) [G04C 3/027] {5}
462.~.~.~ The pendulum controlling indirectly, i.e., without mechanical connection, contacts, e.g., by magnetic or optic means, etc. [G04C 3/027E]