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Amgueddfa Cymru – Museum Wales
'Mines Department Safety Pamphlet No.8 Electrical Signalling Systems and Telephones in Mines.' 11- page pamphlet on cream paper with black printed text and diagrams. Loose inside a black leather hardback cover (with other coal mining regulations, bills etc) with the 'British Thomson-Houston Company / Electrical Engineering Manufacturers / Rugby' printed on it, and a sticker with 'Coal Mines Regulations' stuck on the front cover.
