Patent classifications
E
FIXED CONSTRUCTIONS
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E02
HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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E02B
HYDRAULIC ENGINEERING
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8/00
Details of barrages or weirs; ; Energy dissipating devices carried by lock or dry-dock gates
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E02B8/08
Fish passes; or other means providing for migration of fish; Passages for rafts or boats
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E02B8/085
Devices allowing fish migration, e.g. fish traps
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