US PATENT SUBCLASS 165 / DIG 158
.~.~.~ Having stationary material removal means

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

DIG 135  DD  MOVABLE HEAT EXCHANGER {4}
DIG 139  DD  .~ Fully rotatable {5}
DIG 156  DD  .~.~ Hollow cylindrical member (e.g., drum, etc.) {3}
DIG 158.~.~.~ Having stationary material removal means