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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25/00
Tracks for special kinds of railways
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E01B25/30
Tracks for magnetic suspension or levitation vehicles
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E01B25/34
Switches; Frogs; Crossings
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