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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2203/00
Devices for working the railway-superstructure
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E01B2203/16
Guiding or measuring means, e.g. for alignment, canting, stepwise propagation
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