US PATENT SUBCLASS 396 / 476
.~.~.~ Including pneumatic means

Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

439  DF  CAMERA DETAIL {15}
452  DF  .~ Shutter {12}
475  DF  .~.~ Having mechanically delayed closing {3}
476.~.~.~ Including pneumatic means

DEFINITION

Classification: 396/476

Including pneumatic means:

(under subclass 475) Subject matter wherein the means to hold the shutter open is a member utilizing gaseous pressure differentials.

SEE OR SEARCH THIS CLASS, SUBCLASS:

, FOR 897, for a foreign art collection involving a pivoting or rotating blade shutter having pneumatic retard means.