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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7/00
Remote control of local operating means for points, signals, or track-mounted scotch-blocks
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B61L7/06
using electrical transmission
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B61L7/10
for light signals, e.g. for supervision, back-signalling
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