Lock-up safety valve, boiler pressure 40 lbs. per square inch. n.d.
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- Bookmark:https://archiveshub.jisc.ac.uk/data/gb216-d/dnai/d/dnai/s/59/31
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- ReferenceGB 216 D/D NAI/S/59/31
- Dates of Creationn.d.
- Language of MaterialEnglish
- Physical Description1 plan