Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Pillar-Type Switchgear (booklet)
12 page publicity leaflet describing the design and use of the switchgear. Pamphlet No. 171/10-51. Two holes punched down left side.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.