CPC Subgroup
F22B 37/06 Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
Full Title
Component parts or details of steam boilers > applicable to more than one kind or type of steam boiler > Flue or fire tubes; Accessories therefor, e.g. fire-tube inserts
1 direct subcode
Child Classifications
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- F22B 37/08 Fittings preventing burning-off of the tube edges