Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Hyfro drill jib (booklet)
12 pages : 6 figures and 2 tables Reprint from : University of Durham, King's College Mining Bulletin : 3 : 5 Content summary :- Description and use of above.
Pwnc
Diwydiant
Rhif yr Eitem
1992.336/16
Mesuriadau
Meithder
(mm): 225
Lled
(mm): 145
Dosbarth
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