US PATENT SUBCLASS 159 / 20.2
.~.~ With effect switching means

Current as of: June, 1999
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159 /   HD   CONCENTRATING EVAPORATORS

17.1  DF  MULTIPLE EFFECTS {6}
20.1  DF  .~ Variable or counterflow {1}
20.2.~.~ With effect switching means

DEFINITION

Classification: 159/20.2

With effect switching means:

(under subclass 20.1) Apparatus having means to shift the flow of the material treated.