Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Johnson Mine, ventilation plan
Johnson Mine Four Feet Seam Ventilation Plan. Scale 1:2500. Plan Ref. No. JM/VP/1. Dated 31 3 1995. Folded.
Pwnc
Diwydiant
Rhif yr Eitem
2007.12/33
Mesuriadau
unfolded
(mm): 590
unfolded
(mm): 830
folded
(mm): 304
folded
(mm): 216
Dosbarth
ventilationNid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.