US PATENT SUBCLASS 73 / 1.55
.~.~.~.~.~ Plural coil springs

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.42  DF  .~ Timing apparatus (e.g., fuse, camera, or shutter) {2}
1.43  DF  .~.~ Chronometer (e.g., clock, watch, or watch unbalance) {5}
1.53  DF  .~.~.~ With resilient element {1}
1.54  DF  .~.~.~.~ Coil spring {1}
1.55.~.~.~.~.~ Plural coil springs

DEFINITION

Classification: 73/1.55

Plural coil springs:

(under subclass 1.54) Subject matter wherein the resilient element comprises at least two spirally wound elastic members.