Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Expanding jumper drill
Inscription on card on object :- "Rock drill known as 'expanding jumper' made for widening the bottom of shot holes, drilled by other tools, for blasting"
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.