DIFF Subgroup
F22B 7/18 Walling of flues; Flue-gas header boxes
Introduced: September 1968
Full Title
Steam boilers of furnace-tube type, i.e. the combustion of fuel being performed inside one or more furnace tubes built-in in the boiler body > Component parts thereof; Accessories therefor, e.g. stay-bolt connections > Walling of flues; Flue-gas header boxes
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