DIFF Subgroup
F28D 7/1615 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 in parallel spaced relation (; F28D7/02 - F28D7/10 take precedence)
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.