US PATENT SUBCLASS 73 / 1.42
.~ Timing apparatus (e.g., fuse, camera, or shutter)

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

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.42.~ Timing apparatus (e.g., fuse, camera, or shutter) {2}
1.43  DF  .~.~> Chronometer (e.g., clock, watch, or watch unbalance) {5}
1.56  DF  .~.~> Optical instrument (e.g., camera shutter) or optical sensor

DEFINITION

Classification: 73/1.42

Timing apparatus (e.g., fuse, camera, or shutter):

(under subclass 1.01) Subject matter wherein the device being proven or calibrated measures passage of time.