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These are strong but flexible springs inserted into a pipe to support the pipe walls during manual bending. They have diameters only slightly less than the internal diameter of the pipe to be bent. They are only suitable for bending 15-and-22 mm (0.6-and-0.9 in) soft copper pipe (typically used in household plumbing) or PVC pipe.
The company, first known as Trinity Steel, was founded by C. J. Bender in Dallas in 1933. W. Ray Wallace, an engineering graduate of Louisiana Tech, worked for Dallas's Austin Bridge Company in 1944 before joining the company in 1946 as its seventeenth employee. At the time Trinity Steel manufactured butane tanks in a Dallas County mule barn.
After the construction of pipe networks, the profession of water carrier became obsolete. [233]: 125 Econom: 16: 20: Wheelwright: A wheelwright was an artisan who built or repaired spoked wooden wheels. [46]: 112–120 Wheelwrights established associations to control the trade, for example the Worshipful Company of Wheelwrights. [236]
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The pipe was laid in trenches 4 feet (1.2 m) deep and 3 feet (0.91 m) wide, dug out by a combination of ditching machines and manual labor. [36] The pipes were then cleaned by pulling a workman through the inside of them with cloths, and welded together, using both the "stovepiping" method and the roll-weld, or "firing line", methods. [ 37 ]