Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Witkowitz open hearth furnaces, comparative data
Notes entitled "Witkowitz Open Hearth Furnaces. Comparison of Different Furnaces." Ten pages attached with a paperclip. 5 pages are typed in black and red ink on cream paper and the other 5 pages are handwritten in black ink on cream paper.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.