US PATENT SUBCLASS 368 / 151
.~.~.~.~ Spring

Current as of: June, 1999
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368 /   HD   HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES

139  DF  MECHANICAL TIME BASE {1}
140  DF  .~ Mainspring {7}
147  DF  .~.~ With winding {3}
148  DF  .~.~.~ Self {2}
151.~.~.~.~ Spring

DEFINITION

Classification: 368/151

Spring:

(under subclass 148) Subject matter wherein the automatic means further includes a secondary spring for controlling the mainspring.