Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Collection of tech. drawings re pit props
Engineering Drawing National Coal Board, South West Division, roof control department Showing wastage from sending props greater in length than thickness of seam worked
Pwnc
Diwydiant
Rhif yr Eitem
87.156I/4
Mesuriadau
Meithder
(mm): 573
Lled
(mm): 317
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.