DIFF Subgroup
F22D 1/36 Water and air preheating systems
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Feed-water heaters, e.g. preheaters > Water and air preheating systems
CPC:
Feed-water heaters, i.e. economisers or like preheaters > Water and air preheating systems
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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- F22D 1/38 Constructional features of water and air preheating systems IPC+CPC Available in IPC and CPC