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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E02D29/10
Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes; ; Making conduits in situ, e.g. of concrete; ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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