They are employed by roofing and general contractors, or they may be self-employed.
他们受雇于屋面和总承包商，或者有可能成为自雇人士。
This unit group includes roofing, masonry, painting and other construction trade contractors, not elsewhere classified, who own and operate their own business.
本单元组包括拥有并经营自己的业务的屋顶，砖石，绘画和其他建筑行业承包商及其他未分类的。
This unit group includes roofing, masonry, painting and other construction trade contractors, not elsewhere classified, who own and operate their own business.
本单元组包括拥有并经营自己的业务的屋顶，砖石，绘画和其他建筑行业承包商及其他未分类的。
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