CPC Main Group
F28F 21/00 Constructions of heat-exchange apparatus characterised by the selection of particular materials
6 direct subcodes
Child Classifications
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- F28F 21/02 of carbon, e.g. graphite
- F28F 21/04 of ceramic; of concrete; of natural stone
- F28F 21/06 of plastics material
- F28F 21/08 of metal