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Amgueddfa Cymru – Museum Wales
Scribbled notes in pencil written on the reverse of the top half of a royalt receipt? "on Quasi-Bessemerised Ingot Moulds British Patent 523965/40" with the name of W.S. Williams Bryn-y-Coed, Tirdeunaw, Swansea printed at the top. paper. Notes dated 28 Aug. 1955.
