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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9/00
Fastening rails on sleepers, or the like
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E01B9/38
Indirect fastening of rails by using tie-plates or chairs; Fastening of rails on the tie-plates or in the chairs
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