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Amgueddfa Cymru – Museum Wales
2001.142/37 (1 of 3) - covering letter written by C.H. Watkins. Diagram drawn in pencil on reverse. 2001.142/37 (2 of 3) - page 1 of handwritten letter giving details of invention for improved traffic control lights. 2001.142/37 (3 of 3) - page 2 of handwritten letter giving details of invention for improved traffic control lights.
