US PATENT SUBCLASS 165 / DIG 344
.~.~ Spiral coil forms hemispherical vessel

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

DIG 342  DD  TANK WITH HEAT EXCHANGER {5}
DIG 343  DD  .~ Heat exchanger forms all or portion of tank {2}
DIG 344.~.~ Spiral coil forms hemispherical vessel