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 using 4 ft. timber props too great in diameter.
Pwnc
Diwydiant
Rhif yr Eitem
87.156I/8
Mesuriadau
Meithder
(mm): 271
Lled
(mm): 515
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.