Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Dowty Mining Equipment Limited (booklet)
Folder containing three 'Advance Information Bulletins' titled The Medium Seam Chock, Dowty Equipment for R.O.L.F. Operation, and The Thin Seam Chock. 6 pages, illustrated throughout. Held together in a card folder.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.