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William David Rees ( -1921)
of Swansea Railway-Carriage and Wagon Works, Swansea.
1921 Obituary 
Colonel WILLIAM DAVID REES, of Swansea, died on August 20, 1921, at his London residence. He was an engineer, and carried on an important business in the county of Glamorgan.
Afterwards he opened up business under the style of W. D. Rees & Co., consulting engineers, having offices at Swansea and London.
He was elected a member of the Iron and Steel Institute in 1904.