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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33/00
Machines or devices for shifting tracks, with or without lifting, e.g. for aligning track, for shifting excavator track
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E01B33/06
for slewing in a continuous operation, e.g. for tracks which carry excavators
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E01B33/08
Boom track-slewing machines
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