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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5/00
Rails; Guard rails; Distance-keeping means for them
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E01B5/08
Composite rails; Compound rails with dismountable or non-dismountable parts
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