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Amgueddfa Cymru – Museum Wales
'Senior 'H' Tube Economiser of 7874 sq ft Heating Surface Arranged 14 wide 8 high 11'-5' Tubes. Powell Duffryn Associated Colleries, Bargoed Colliery.' Drawing no. CAS64. Scale ΒΌ" to 1ft. Dated 9 May 1942.
