(under the class definition) Devices constructed of a plurality of relatively movable flow obstructing elements, which collectively close a single port.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1.1, for plural annular segments con-structed to close about a rod or pipe.
SEE OR SEARCH CLASS
250, Radiant Energy,
229+, for iris diaphragms for pre-photocell light control. 359, Optics: Systems (Including Communication) and Elements,
227+, for light control by means of movable opaque elements.
