This unit group includes plumbing and other pipefitting trade contractors who own and operate their own businesses.
此单元组包括管道和其他管道安装行业承包商，其拥有并经营自己的企业。
This unit group includes carpentry and cabinetmaking trade contractors who own and operate their own businesses.
本单元组包括拥有和经营自己企业的木工和细木工行业承建商。
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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