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PCE
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CPC Subgroup
F28D 7/12

the surrounding tube being closed at one end, e.g. return type (F28D7/14 takes precedence)

Full Title

Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall > the conduits being arranged one within the other, e.g. concentrically > the surrounding tube being closed at one end, e.g. return type (F28D7/14 takes precedence)