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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3/00
Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
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E01B3/28
made from concrete or from natural or artificial stone
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