DIFF Subgroup
F22B 21/30 bent in U-loop form
Introduced: September 1968
Full Title
Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically > built-up from water tubes of form other than straight or substantially straight > bent in U-loop form
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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- F22B 21/32 disposed horizontally in abutting connection with upright headers or rising water mains IPC+CPC Available in IPC and CPC