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Amgueddfa Cymru – Museum Wales
2001.142/32 (1 of 3) - Patent No. 2421. Dated 29th January 1914. 2001.142/32 (2 of 3) - Letter dated May 7th 1915 sent by A.A. Thornton to C.H. Watkins of 45 Colum Road, Cardiff. 2001.142/32 (3 of 3) - Patent Office Form P.Acc.4. Dated 6th May 1915.
