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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.
Collection Area
Industry
Item Number
87.156I/6
Historical Associations
Associated Person/Body: National Coal Board, South Western Division
Association Type: Coal company
Acquisition
collected officially, 14/8/1987
Measurements
Length
(mm): 332
Width
(mm): 407
Material
Paper
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