(under subclass 261) Means including conveying means, other than agitators which directly force material through the sifting passages.
(1) Note. These conveying means may be conveyors of a mechanical nature operating substantially in the direction in which the undersize passes through the sifting passages or may be means for forcing fluid in the direction specified.
(2) Note. Where fluid is employed to force material through the passages of a sifter, it must be a fluid supply which does not merely agitate the material on the sifter, but must exert substantial force in the direction of passage through the sifting passages.
