(under subclass 261) Devices associated with sifters which retard the passage of material over the sifting surfaces and which are not primarily agitators.
SEE OR SEARCH THIS CLASS, SUBCLASS:
266, and 314, and the appropriate sifter with agitator subclasses, for sifters with guides or agitators, superposed stepped sifters etc., which may function to retard the passage of material over the sifting surfaces.
SEE OR SEARCH CLASS
460, Crop Threshing or Separating,
59+, and 79+, straw carriers for threshing machines and cylinder type threshing machines.
