Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Patent
U.S.A. letters patent issued to Charles Horace Watkins re. sparking plugs. Patent number '1263719', dated 23rd April 1918. Contains a diagram with two page description bound with blue tape with red paper seal bottom left.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.