US PATENT SUBCLASS 968 / 377
PROTECTING CLOCKWORKS BY SHIELDS OR OTHER MEANS AGAINST EXTERNAL INFLUENCES, E.G., MAGNETIC FIELDS, ETC. (demagnetizing apparatus subclass 783) [G04B 43/00]


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968 /   HD   HOROLOGY

377PROTECTING CLOCKWORKS BY SHIELDS OR OTHER MEANS AGAINST EXTERNAL INFLUENCES, E.G., MAGNETIC FIELDS, ETC. (demagnetizing apparatus subclass 783) [G04B 43/00] {3}
378  DD  .~> Component shock protection arrangements (shock damping bearings subclass 282; shock-damping in the case subclass 307; protection of the pendulum or chime during transport subclass 375) [G04B 43/00B]
379  DD  .~> Protection against temperature influences [G04B 43/00C]
380  DD  .~> Antimagnetic alloys (antimagnetic alloys with temperature compensation subclass 129; apparatus for antimagnetizing subclass 783; alloys in general C22C) [G04B 43/00R]