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Amgueddfa Cymru – Museum Wales
A patent specification, a copy of the provisional specification, two plans of the device and three letters relating to the invention of the 'Trewill Dust Trap'. All documents held together by a paperclip. Two provisional specifications for the patent, one is printed in black ink on off white paper, the other is typed in purple ink on off-white paper. A patent specification granted to Stanley Williams for 'improvements in apparatus for trapping dust in rock drilling and like operations'. Two plans printed in black ink on off-white paper. A plan showing 'a reproduction of the original on a reduced scale'. Also, three letters printed in black ink on off-white, Tredegar Iron Co.Ltd headed paper. Letters from the Tredegar Iron & Coal Co. Limited to Stanley Williams regarding the patent on his invention.
