US PATENT SUBCLASS 165 / DIG 515
.~ Patterned surface (e.g., knurled, grooved)

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165 /   HD   HEAT EXCHANGE

DIG 510  DD  HAVING HEAT EXCHANGE SURFACE TREATMENT, ADJUNCT OR ENHANCEMENT {7}
DIG 515.~ Patterned surface (e.g., knurled, grooved) {1}
DIG 516  DD  .~.~> Subsurface pockets formed