(under subclass 370) Closures other than feed or discharge controlling valves associated with the casings which inclose sifters in part or in whole.
(1) Note. These closures ordinarily open or close portions of the casing to give access to the interior for the insertion or removal of material or the sifting device or parts thereof.
(2) Note. This subclass does not include receptacle covers, per se, but may include covers of receptacles when a sifter is included in the combination or there is some special structure adapting for use with sifters.
SEE OR SEARCH THIS CLASS, SUBCLASS:
419, for sifters associated with shovels.
SEE OR SEARCH CLASS
49, Movable or Removable Closures, appropriate subclasses, for closures of the type provided for and see the search notes thereto in section IV for the loci of closures in other classes.
