US PATENT SUBCLASS 165 / DIG 15
.~.~ With pump

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

DIG 9  DD  HAVING A SOLID HEAT STORAGE MASS FOR ABSORBING HEAT FROM ONE FLUID AND RELEASING IT TO ANOTHER (I.E. REGENERATOR) {5}
DIG 13  DD  .~ Movable heat storage mass with enclosure {3}
DIG 15.~.~ With pump