US PATENT SUBCLASS 368 / 140
.~ Mainspring

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

139  DF  MECHANICAL TIME BASE {1}
140.~ Mainspring {7}
141  DF  .~.~> With protection means
142  DF  .~.~> With mainwheel on barrel
143  DF  .~.~> With mainwheel on arbor
144  DF  .~.~> With attachment means for spring
145  DF  .~.~> With winding and setting {1}
147  DF  .~.~> With winding {3}
154  DF  .~.~> With spring click

DEFINITION

Classification: 368/140

Mainspring:

(under subclass 139) Subject matter wherein the mechanical power supply is a spring which is designated for use as the

principal motive power in a timepiece.