Patent classifications
E
FIXED CONSTRUCTIONS
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E01
CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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E01B
PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
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2204/00
Characteristics of the track and its foundations
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E01B2204/03
Injecting, mixing or spraying additives into or onto ballast or underground
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