US PATENT SUBCLASS 396 / FOR 900
.~.~.~.~ Including cam means (354/260)

Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

FOR 842  DF  CAMERA DETAILS (354/202) {10}
FOR 866  DF  .~ Shutter (354/226) {10}
FOR 890  DF  .~.~ Pivoting or rotating blade (354/250) {6}
FOR 896  DF  .~.~.~ Having retard means (354/256) {4}
FOR 900.~.~.~.~ Including cam means (354/260)

DEFINITION

Classification: 396/FOR.900

Including cam means: (354/260)

Subject matter under subclass FOR 896 wherein the means to hold a shutter open is provided with a surface of fixed points of varying distance from a fixed point which surface is in contact with a follower to vary the time the shutter remains open.