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1 Watertight chamber in which underwater construction work takes place.

2 Device for sinking foundations under water or in water-logged conditions, in the form of an air-tight box the size of the pier to be built, which is sunk to bedrock, or other surface on which it is to remain, then filled with concrete.

3 Coffer in ceilings, cupolas, soffits, and vaults.

Subjects: Arts and Humanities — Warfare and Defence.

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