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Amgueddfa Cymru – Museum Wales
Two diagrams on one page, both showing the 'Brierely Type Aerophor Breathing Apparatus made by Guest & Chrimes Ltd. Rotherham' Printed in black ink on cream paper. The diagrams have been cut out and glued onto a blank page. 88.98I/1 (1) - (17) were originally stored together in an acidic card file.
