|Industrial Chicago, "Building Interests," 1891
A national master plumber's association was organized in 1880 with chapters in cities like Chicago. The association regulated apprenticeships and provided its membership with the latest information about plumbing technology. Local governments began to demand licensing of plumbers and equipment, to protect residents from substandard work. This discussion drawn from the second volume of the 1891 Industrial Chicago dealt with among other things, plumbing arrangements in Chicago.
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