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Amgueddfa Cymru – Museum Wales
Patents and Designs Acts. 1907-1919. Form No. 3 Complete Specification. No. 22090 Dated September 8th 1920. Improvements in or Connected with the Trolley Heads of Electric Tramcars. Patent applied for by Charles Horace Watkins of 45 Colum Road, Cardiff. 5 pages held together top left by metal clip.
