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Amgueddfa Cymru – Museum Wales
Full title 'Trewill' Dust Trap Apparatus for Prevention of Silicosis', maufactured by Tredegar Iron & Coal Co. Ltd, approved by Mines dept. Patent application No. 11962/30. Two page booklet on the Trewill dust trap, including a black and white photograph of the dust trap in operation and a diagram. Printed in black ink on white paper.
