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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17/00
Excavations; Bordering of excavations; Making embankments
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E02D17/06
Foundation; trenches; ditches or narrow shafts
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E02D17/08
Bordering or stiffening the sides of ditches; trenches; or narrow shafts for foundations
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