US PATENT SUBCLASS 396 / 500
.~.~.~.~ Symmetrical opening


Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

439  DF  CAMERA DETAIL {15}
452  DF  .~ Shutter {12}
493  DF  .~.~ Pivoting or rotating blade type {3}
497  DF  .~.~.~ Plural oscillating blades {4}
500.~.~.~.~ Symmetrical opening


DEFINITION

Classification: 396/500

Symmetrical opening:

(under subclass 497) Subject matter wherein the blades move

in diverse directions from or toward a center and form an aperture which always varies the same from the center.

SEE OR SEARCH THIS CLASS, SUBCLASS:

, FOR 904, for a foreign art collection involving a shutter having plural oscillating blades forming a symmetrical opening.