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 need for special supports at roadheads in highly inclined seams
Pwnc
Diwydiant
Rhif yr Eitem
87.156I/7
Derbyniad
Collected officially, 14/8/1987
Mesuriadau
Meithder
(mm): 436
Lled
(mm): 370
Techneg
dyeline
Deunydd
papur
Lleoliad
In store
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