Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Dowty Mining Equipment Limited (folder of documents)
'Dowty. Aids to face design. Establishing support resistance by the use of nomograms'. Folder containing six laminated documents relating to support load calculations.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.