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Amgueddfa Cymru – Museum Wales
Printed in black ink, with typed details in purple ink. Some details are handwritten in pencil The United Anthracite Collieries Ltd., Pentremawr Collieries. A table charting the results of a trial of Belliss Air Compressor No.568. Loose within a beige/light brown card file labelled 'general information file, power generation' and 'compressed air production.'
