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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2202/00
Characteristics of moving parts of rail systems, e.g. switches, special frogs, tongues
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E01B2202/04
Nature of the support or bearing
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