商业类搜索引擎及目录索引

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管工 Plumbing：

BathWeb - Directory for the bathroom industry. Find information on bathroom manufacturers, cabinet dealers, designers and remodelers, design software, and bathroom specialists.

PlumbingNet - Directory of plumbing manufacturer addresses.

PlumbingWeb - Plumbing directory. Find plumbing contractors, wholesalers, publications, and online distributers.