3103 Manufacture of mattresses

31.03.1 Mattresses
31.03.11 Mattress supports
31.03.12 Mattresses, excluding mattress supports
This subcategory excludes:
- mattress supports, see 31.03.11
31.03.9 Sub-contracted operations as part of manufacturing of mattresses
31.03.99 Sub-contracted operations as part of manufacturing of mattresses