Patent classifications
E
FIXED CONSTRUCTIONS
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E02
HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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E02F
DREDGING; SOIL-SHIFTING
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5/00
Dredgers or soil-shifting machines for special purposes
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E02F5/30
Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
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E02F5/305
Arrangements for breaking-up hard ground
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