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Amgueddfa Cymru – Museum Wales
Two letters attached with a paperclip. Typed in black ink on cream paper. One letter from J.C. Hayman (refractories engineer) to Mr N. Gray (chief metallurgist, East Moors Works) re. Sedimentation test on dust ex. new extractor at agglomerate plant. The other letter is from Western Metallurgical Industries to C.A. Edwards re. the analysis of flue dust from the new extractor at East Moors works.
