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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25/00
Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
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B61L25/02
Indicating or recording positions or identities of vehicles or trains
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B61L25/04
Indicating or recording train identities
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