Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Patent specification
Provisional Patent Specification 1686/39. Copy of typed specification on two pages.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.
Amgueddfa Cymru
Provisional Patent Specification 1686/39. Copy of typed specification on two pages.