US PATENT SUBCLASS 165 / DIG 151
.~.~.~.~ Having hollow blade

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 147  DD  .~.~ Fluid impeller or material advancer {2}
DIG 150  DD  .~.~.~ Radial or axial impeller {1}
DIG 151.~.~.~.~ Having hollow blade