US PATENT SUBCLASS 165 / DIG 82
.~.~ Grooved drum surface

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 76  DD  WITH SCRAPER FOR REMOVING PRODUCT FROM HEAT TRANSFER SURFACE {4}
DIG 81  DD  .~ Rotary heat exchange scraper or scraper for rotary heat exchange surface {10}
DIG 82.~.~ Grooved drum surface