首页>
外国专利>
Device applicable to the steam boiler, or other and to the furnaces, in general, to eliminate the drawback of the introduction of cold air into the combustion chamber, which takes place at each loading of fuel
Device applicable to the steam boiler, or other and to the furnaces, in general, to eliminate the drawback of the introduction of cold air into the combustion chamber, which takes place at each loading of fuel