| http://www.w3.org/ns/prov#value | - changer; (c) providing an access opening through the shell including the manifold and the body of the unitary heat exchanger so as to provide access to the sacrificial core from outside the shell; and (d) removing the sacrificial core from within the shell of the unitary heat exchanger through the access opening, thereby leaving a passage within the manifold that opens into a passage formed betwee
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