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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27/00
Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
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E01B27/02
Placing the ballast; Making ballastway; Redistributing ballasting material; Machines or devices therefor; Levelling means
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E01B27/023
Spreading, levelling or redistributing ballast already placed
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E01B27/026
by means of driven tools, e.g. rotating brooms or digging devices
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