US PATENT SUBCLASS 73 / 1.56
.~.~ Optical instrument (e.g., camera shutter) or optical sensor

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}
1.56.~.~ Optical instrument (e.g., camera shutter) or optical sensor

DEFINITION

Classification: 73/1.56

Optical instrument (e.g., camera shutter) or optical sensor:

(under subclass 1.42) Subject matter wherein the timer being proven or calibrated is either (a) an instrument which is operated by light or (b) an element whose characteristic changes in response to light.