US PATENT SUBCLASS 968 / 112
.~.~ Oscillators with coil springs stretched and unstretched axially [G04B 17/08]


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968 /   HD   HOROLOGY

103  DD  MECHANISMS FOR STABILIZING FREQUENCY (magnetic subclass 497; in striking mechanisms subclass 224; stopping and regulating of the running subclass 234; electrical and thermoelectric regulating mechanisms subclass 496) [G04B 17/00] {8}
107  DD  .~ Oscillators acting by spring tension [G04B 17/04] {4}
112.~.~ Oscillators with coil springs stretched and unstretched axially [G04B 17/08]