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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B61L23/08
for controlling traffic in one direction only
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B61L23/16
Track circuits specially adapted for section blocking
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B61L23/168
using coded current
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