2821 Manufacture of ovens, furnaces and furnace burners

282111 Furnace burners/ mechanical stokers and grates/ mechanical ash dischargers and the like 282112 Industrial or laboratory furnaces and ovens, non-electric, including incinerators, but excluding bakery ovens 282113 Industrial or laboratory electric furnaces and ovens/ induction or dielectric heating equipment 282114 Parts of furnace burners, furnaces and ovens