The construction of Boulder Dam, later renamed as the Hoover Dam. Exteriors of Babcock and Wilcox Mill near Boulder Dam construction site, Nevada. Steel sheets manufactured. Technicians and workers work with equipment. Pipe units are made from sheets after shaping the sheets. Worker welds sheets. Man work with equipment during laboratory tests. Men work with huge pipe units. High capacity cranes swinging pipe unit. Giant lathe used to join individual sections of pipe units. Pipe section ready for insulation. Tractor trailer carrying a giant pipe unit on road. Pipe unit on Canyon rim, exactly over the dam site. Pipe unit is maneuvered for loading into the Canyon. Man at control tower of the cable way on cliff. Pipe unit transferred through cable ways. Pipe lowers into the canyon. Pipe units taken into tunnel.
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