US PATENT SUBCLASS 165 / DIG 166
.~ Vertically spaced pipe sections contact liquid in underlying troughs


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165 /   HD   HEAT EXCHANGE

DIG 163  DD  INCLUDING A MEANS TO FORM FLUID FILM ON HEAT TRANSFER SURFACE (E.G., TRICKLE) {8}
DIG 166.~ Vertically spaced pipe sections contact liquid in underlying troughs