(under subclass 208) Subject matter in which the light interrupting areas of the shutter include openings or blades have particular edge configurations which are adapted to interrupt the light in accordance with the particular blade construction at a rate different from an opaque sector blade.
SEE OR SEARCH THIS CLASS, SUBCLASS:
212+, for shutters which intercept the light at a radial shutter rate but which modify the light beam as to intensity or some other optical parameter.
