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Knee and t-joints made about 4000 BCE
Found in the excavation of the Temple of Bel at Nippur, Babylonia. Pipe
was made of baked clay. Babylonia is often referred to as the birthplace
of pipe.
Source: Cast Iron Pipe, Standard Specifications Dimensions and Weights
(Burlington, New Jersey: United States Cast Iron Pipe & Foundry
Co.,1914), p. 13.
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