Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Collection of tech. drawings re pit props
Engineering Drawing National Coal Board, South West Division, roof control department Diagram showing that steel props are 3 times stronger than timber props.
Pwnc
Diwydiant
Rhif yr Eitem
87.156I/6
Derbyniad
Collected officially, 14/8/1987
Mesuriadau
Meithder
(mm): 332
Lled
(mm): 407
Techneg
dyeline
Deunydd
papur
Lleoliad
In store
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