US PATENT SUBCLASS 165 / DIG 168
.~ Film formed on interior surface of container or pipe

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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 168.~ Film formed on interior surface of container or pipe {1}
DIG 169  DD  .~.~> Inside of vertical pipe {1}