Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B61
RAILWAYS
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B61L
GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
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23/00
Control, warning or like safety means along the route or between vehicles or trains
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B61L23/04
for monitoring the mechanical state of the route
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B61L23/042
Track changes detection
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B61L23/048
Road bed changes, e.g. road bed erosion
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