Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Papers re. sparking plug, 1917
Blueprint of original (2001.142/20) technical drawing for a spark plug titled - 'C.H.W. Sparking Plug'. Scale twice full size.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.