US PATENT SUBCLASS 159 / 17.3
.~ Variant multistaging

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159 /   HD   CONCENTRATING EVAPORATORS

17.1  DF  MULTIPLE EFFECTS {6}
17.3.~ Variant multistaging

DEFINITION

Classification: 159/17.3

Variant multistaging:

(under subclass 17.1) Apparatus wherein the evaporation varies in kind in the different stages.