E21D 11/00
Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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Edits on 16 Mar, 2022
Golden AI
Golden AI
Edits on 5 Mar, 2022
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Golden AI
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E21D 11/00
Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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