F22B13/10 - CPC Classification

Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body; Locomobile, traction-engine, steam-roller, or locomotive boilers with auxiliary water tubes inside the fire-box

• F22B13/12 » the auxiliary water tubes lining the fire-box 0