CPC Subgroup
F28D 7/02 the conduits being helically coiled (F28D7/10 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 helically coiled (F28D7/10 takes precedence )
4 direct subcodes
Child Classifications
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