الأصناف الرئيسية
2X
الأقسام
الفروع
- 690Buildings
- 691Building materials
- 692Auxiliary construction practices
- 693Specific materials & purposes
- 694Wood construction & carpentry
- 695Roof covering
- 696Utilities
- 697Heating, ventilating & air-conditioning
- 698Detail finishing
- 699[Unassigned]