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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
Collection Area
Industry
Item Number
87.156I/7
Historical Associations
Associated Person/Body: National Coal Board, South Western Division
Association Type: Coal company
Acquisition
collected officially, 14/8/1987
Measurements
Length
(mm): 436
Width
(mm): 370
Material
Paper
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