US PATENT SUBCLASS 165 / DIG 165
.~ Film formed on spirally coiled member

Current as of: June, 1999
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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 165.~ Film formed on spirally coiled member