(under subclass 563) Apparatus provided with means to vary the total effective length and total effective width of all or part of the outlets.
(1) Note. These devices usually include a valve device which opens or closes one or more of a plurality of outlets sequentially or serially in its movement together with means which opens or closes other outlets in a plane normal to the first mentioned control. These controls may comprise a single valve means which is mounted for longitudinal and rotary motion or separate means mounted for such longitudinal and rotary motion.
