US PATENT SUBCLASS 239 / 59
.~.~ By alignment of apertured members

Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

34  DF  SLOW DIFFUSERS {9}
58  DF  .~ With means to adjust casing porosity or openings {1}
59.~.~ By alignment of apertured members

DEFINITION

Classification: 239/59

(under subclass 58) Apparatus in which varying of openings is accomplished by bringing a plurality of perforations into and out of registry with one another to open and close communication between the material space and the ambient atmosphere.