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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E02D29/12
Manhole shafts; Other inspection or access chambers; Accessories therefor
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E02D29/14
Covers for manholes or the like; Frames for covers
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E02D29/1436
with overflow or explosion control means, e.g. check or relief valves
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