US PATENT SUBCLASS 73 / 1.53
.~.~.~ With resilient element

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.~.~.~ With resilient element {1}
1.54  DF  .~.~.~.~> Coil spring {1}

DEFINITION

Classification: 73/1.53

With resilient element:

(under subclass 1.43) Subject matter wherein either (a) the apparatus for proving or calibrating the chronometer or (b) the chronometer being proven or calibrated includes a means having a capacity of returning to an original form immediately upon the withdrawal of a force which causes compression or distortion.