Patent classifications
E
FIXED CONSTRUCTIONS
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E02
HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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E02D
FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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29/00
Independent; underground or underwater structures; Retaining walls
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E02D29/063
Tunnels submerged into, or built in, open water
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E02D29/073
Tunnels or shuttering therefor assembled from sections individually sunk onto, or laid on, the water-bed, e.g. in a preformed trench
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