US PATENT SUBCLASS 352 / 220
.~.~.~ Variable number of blades

Current as of: June, 1999
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352 /   HD   OPTICS: MOTION PICTURES

204  DF  SHUTTERS {3}
208  DF  .~ Rotary {7}
219  DF  .~.~ Single drive (e.g., disc type) {1}
220.~.~.~ Variable number of blades

DEFINITION

Classification: 352/220

(under subclass 219) Subject matter in which the number of blades may be changed, as by adding or removing blades or superimposing blades to effectively reduce the number.