Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Papers re. sparking plug, 1917
Blueprint of technical drawing of a spark plug. Very feint at top left 'Watkins' / Sparking Plug'.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.