US PATENT SUBCLASS 165 / DIG 506
.~ Side-by-side conduits with means (e.g., support grid) holding them in spaced relation


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165 /   HD   HEAT EXCHANGE

DIG 454  DD  HAVING SIDE-BY-SIDE CONDUITS STRUCTURE OR CONDUIT SECTION {16}
DIG 506.~ Side-by-side conduits with means (e.g., support grid) holding them in spaced relation