6973: Cooking or heating apparatus, non-electric, domestic

69731: Domestic cooking appliances, non-electr., iron, steel 69732: Domestic stoves, & similar, non-electric, iron, steel 69733: Parts, of iron or steel, of headings 69731 & 69732 69734: Cooking or heating appara., non-elec., domes., copper 6973: Cooking or heating apparatus, non-electric, domestic