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Amgueddfa Cymru – Museum Wales
Printed in black ink, with typed details in purple ink. Some details are handwritten in pencil Amalgamated Anthracite Collieries Ltd., Diamond Colliery, Guernos. Trial of Belliss Air Compressor No.1802, and steam consumption tests. Loose within a beige/light brown card file labelled 'general information file, power generation' and 'compressed air production.'
