DIFF Subgroup
F23J 3/02 Cleaning furnace tubes; Cleaning flues or chimneys
Introduced: September 1968
Full Title
Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers > Cleaning furnace tubes; Cleaning flues or chimneys
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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